---
title: "Garage Door Opener Blink Codes: What Is It Trying to Tell You?"
page_title: "Garage Door Opener Blink Codes: Count the Flashes"
description: "Count the flashes and find the fault. LiftMaster two-digit up and down codes, older single-LED codes, the 10-flash light signal and Genie's own charts."
url: "https://farnsworthgarage.com/garage-door-opener-troubleshooting/garage-door-opener-blink-codes/"
type: "opener-symptom"
published: "2026-09-01T19:29:45Z"
modified: "2026-09-01T19:37:39Z"
publisher: "Farnsworth Garage Door Service, Mesa, AZ"
phone: "(602) 935-9766"
---
# Garage Door Opener Blink Codes: What Is It Trying to Tell You?

A blinking opener light is not a malfunction. It's a message, and on most units it's a precise one — the opener has already worked out what's wrong and is spelling it out in flashes. The trouble is that almost nobody knows the alphabet, so people watch the light flicker, decide the opener is dying, and start pricing replacements.

The other thing almost nobody knows is that there isn't one code system. There are three separate signals, they live on three different lights, and reading the wrong chart is how you end up convinced you have a dead motor when you actually have a spider web on a photo eye. So before you count anything: find out *which light* is talking to you.

⚠ **Hands-on repair — moderate risk** Involves tools and adjustment. Read the whole section before you start, and we’ll mark where to stop.

This is general guidance based on what we see on service calls — it isn’t a substitute for someone looking at your actual door. Every door is a little different, and if anything here feels beyond what you want to take on, stop and [give us a call](tel:+16029359766).

## A few codes mean stop, not troubleshoot

Most blink codes are harmless information. These are the situations where the right move is to leave the door alone.

-   You can smell something hot, sharp, or electrical near the opener.
-   The housing is discoloured, scorched, or too hot to rest your hand on.
-   The unit reports a motor circuit fault repeatedly, even after it has been left to cool right down.
-   There was a loud bang before the blinking started, and the door has felt different since.
-   The motor buzzes or strains while the light flashes, instead of running cleanly.
-   The door is sitting crooked, or a cable has slackened off its drum.

A code is only a report. It tells you what circuit the opener is unhappy about, not whether the door above your head is still hanging the way it should be. Electrical smell means insulation is already breaking down, and no amount of code-reading changes that. A bang followed by new codes usually means the opener is reporting a strain that started somewhere in the springs or cables. In either case, unplug it, keep the doorway clear, and give us a ring.

[Call (602) 935-9766](tel:+16029359766)

Start Here

## What to check in the next 10 minutes

Four things before you look anything up. Counting badly is the number one reason people decode the wrong fault.

1.  1

    **Work out which light is doing the talking**

    There are three separate signals and they live on three different lights. The light *bulbs* flashing about ten times is a fixed sensor-refusal message on LiftMaster and Chamberlain units, not a numbered code. A small LED beside the Learn button flashes a single number, one to six. A pair of UP and DOWN arrows on the powerhead flashes a two-digit code. Genie splits it differently again — the Safe-T-Beam sensors report on their own housings, and Excelerator screw-drive models have a separate status LED under the lens cover. Find yours before you count anything.

    You’ll know it worked when: You know which indicator on your system is the one reporting, and therefore which chart applies.

2.  2

    **Trigger the fault, then count the group**

    Press the wall button, then watch. Codes come in groups with a distinct pause between them. On a single-LED unit that's flash-flash-flash, pause, flash-flash-flash. On a two-digit unit it's a run of UP arrow flashes, then a run of DOWN arrow flashes, then the pause. Count one full cycle, wait for the pause, and count again to confirm you got the same reading. People routinely turn four blinks into ten by counting across the pause.

    You’ll know it worked when: You've counted the same number twice in a row with a clear gap between.

3.  3

    **Note whether the door attempted to move**

    There's a real difference between an opener that flashes and refuses to budge, one that starts down and reverses while flashing, and one that runs the whole cycle and flashes afterwards. Write down which yours does — it changes the interpretation of the same code.

    You’ll know it worked when: You can describe exactly what the door did while the light was flashing.

4.  4

    **Glance at the two sensors near the floor**

    Before decoding anything, look at the pair of photo eyes six inches or so off the concrete at either side of the opening. Two steady lights rules out about half the code list in one glance. A dark, dim, or flickering one confirms the other half.

    You’ll know it worked when: You know whether both sensor indicators are lit and holding steady.

## First question: which light is flashing?

This one question routes you to the right chart. Get it wrong and every number you read afterward means something else.

Is it the **light bulbs** in the opener flashing, or a **small indicator on the powerhead itself** — an LED beside the Learn button, or a pair of UP and DOWN arrows?

The light bulbs are flashing — about ten times

**What that means:** That is not a numbered fault code. On LiftMaster and Chamberlain units, ten bulb flashes is a single fixed message: the opener was told to close, the safety sensor circuit did not check out, and it refused. It is the same signal whether the wires are cut, shorted, reversed, or the beam is simply blocked. If your opener has no bulbs fitted, you'll hear it click ten times instead as it tries to flash lights that aren't there.

**Where to go next:** Go straight to the sensor causes below — and know that Chamberlain retired this signal on openers and logic boards built after February 3, 2022, so a newer unit may say nothing at all.

A small LED next to the yellow, purple, red or green Learn button

**What that means:** You have the older single-count system. It flashes a number between one and six, pauses, then repeats. Six codes cover the whole chart, and four of them are things you can sort out yourself. Use the single-LED table below.

**Where to go next:** Count one full group between pauses, then read the older-unit table.

A pair of UP and DOWN arrow indicators on the powerhead

**What that means:** You have a Security+ 2.0 opener — generally a yellow Learn button, built 2011 or later. These report a *two-digit* code: the UP arrow flashes a few times, then the DOWN arrow flashes a few times, then it pauses and repeats. One UP and five DOWN is code 1-5, and it means something entirely different from five flashes on an older unit.

**Where to go next:** Count the UP flashes, then the DOWN flashes, then read the two-digit table.

A fourth possibility worth ruling out in ten seconds: a failing bulb. An LED bulb with a struggling driver flickers in a way that looks alarming and means nothing at all. If the flicker has no rhythm and no pause, swap the bulb before you diagnose the opener.

## Which version of blinking is yours?

The same flashing means different things depending on what the door is doing at the time. Find the description that fits.

Bulbs flash ten times and the door won't close

The sensor circuit failed its check. It's the most common thing on this page by a distance, and usually the cheapest to fix.

[Jump to that fix ↓](#cause-1)

Flashes and the door won't move at all

The opener stopped at the safety check before the motor ever engaged. Nearly always the sensor family.

[Jump to that fix ↓](#cause-1)

Starts down, reverses, then flashes

The close cycle began and something interrupted it partway — a brief beam break rather than a wiring fault.

[Jump to that fix ↓](#cause-3)

Motor hums or clicks but the door barely moves

A no-rotation code. The opener is reporting that the shaft didn't turn, which usually means something is physically stopping the door.

[Jump to that fix ↓](#cause-5)

Door opens, then creeps back down on its own

The opener detected rotation after it shut off. Check the manual release before anything else — a release left pulled produces this exact code.

[Jump to that fix ↓](#cause-6)

Flashes constantly with no fault behavior

Timer-to-close warning, an app command, or a battery status report. Not a fault code.

[Jump to that fix ↓](#cause-8)

No blink at all, just nothing

Either a unit with no power, or an opener built after February 2022 that simply doesn't use the ten-flash signal anymore.

[Jump to that fix ↓](#cause-8)

The wall console light is blinking, not the opener

Console indicators usually report lock status or a communication problem between the console and the powerhead, not a motor or sensor fault.

[Jump to that fix ↓](#cause-2)

## Why openers talk in flashes, and why there are three languages

A garage door opener is a small computer with almost no way to talk to you. No screen, no speaker worth the name, no port anyone was ever going to plug into. So manufacturers used the lights they already had. The logic board runs a self-check every time you ask it to do something, and if a monitored circuit answers wrong, it flashes.

The oldest surviving version of this is the **ten-flash bulb signal** on LiftMaster and Chamberlain units. It isn't a numbered code and it doesn't discriminate: it just means the opener was asked to close, the safety sensor circuit didn't pass its check, and the close was refused. Chamberlain has confirmed that openers and replacement logic boards manufactured after February 3, 2022 no longer include this feature, which is why a newer opener can refuse to close while sitting there in complete silence.

Alongside it, AC-powered openers carry a small **diagnostic LED next to the Learn button** that flashes one to six times. That's the single-count system, and it's the one most people mean when they say “blink codes.” One, two and four are sensor-related; three is the wall control; five means the opener detected no rotation in the first second of movement; six means the motor circuit has failed.

Then in 2011 Security+ 2.0 arrived and changed the grammar entirely. Those units — yellow Learn button, UP and DOWN adjustment arrows on the powerhead — report **two-digit codes**: so many UP flashes, then so many DOWN flashes. Codes run from 1-1 to 5-5, and the numbers do not line up with the old system. On an older unit, five flashes and six flashes are two different motor problems. On a Security+ 2.0 unit, 1-5 is a rotation fault and 1-6 is a door that drifted down after opening — which is sometimes just a manual release someone forgot to reconnect.

Genie does something different again, and splits it across two charts: the powerhead has its own status LED on some series, and the Safe-T-Beam sensors report separately through indicators on the sensor housings themselves. Both are covered below, and they are not the same chart.

One thing none of these codes can tell you is anything about the door. The opener has no idea whether your springs are healthy. It only knows how much current the motor drew, whether the shaft turned, and whether the circuits it monitors answered properly. That's why a mechanical problem in the door often surfaces as a motor-related code, and why we still test door balance by hand on a call that started as a code lookup.

**Two-digit code** UP arrow flashes, then DOWN arrow flashes, then a pause. Read as “1-5”, not “six”.

**Single-count code** One number of flashes on the LED beside the Learn button, then a pause. One through six.

**Ten-flash signal** The light bulbs flashing about ten times. A fixed “sensors didn't check out” message, not a numbered code.

**Terminal strip** The row of low-voltage screws on the opener where the sensors and wall control land. Most sensor and wall-control codes live here.

**RPM sensor** The part that tells the board the motor shaft is actually turning. Codes about “no RPM” come from here or from something stopping the door.

**Cable tension monitor** A small switch on wall-mount and jackshaft openers that watches for slack in the lift cable. Its own dedicated code.

Once you know which of the three signals you're reading, the anxiety mostly goes out of it. The light is being helpful. Identify it, then count it.

## What you're seeing, and which chart it belongs to

Start here rather than in a code table. The right-hand column is our honest read on whether this one is yours or ours.

| What you’re seeing | Most likely cause | How urgent | Who should fix it |
| --- | --- | --- | --- |
| **Light bulbs flash ~10 times, door won't close** | Fixed sensor-circuit refusal on LiftMaster/Chamberlain — blocked, misaligned, cut, shorted or reversed | Fix today | Usually you |
| **Opener clicks ~10 times, no bulbs fitted** | The same sensor refusal — it's trying to flash lights that aren't there | Fix today | Usually you |
| **LED by the Learn button: 1, 2 or 4 flashes** | Sensor circuit — open wire, short or reversed pair, or a weak beam | Fix today | Either — call us if unsure |
| **LED by the Learn button: 3 flashes** | Wall control wiring shorted | Fix this week | Either — call us if unsure |
| **LED by the Learn button: 5 flashes** | No rotation detected in the first second — usually a mechanical stoppage, not the motor's fault | Stop cycling it | Call a pro |
| **LED by the Learn button: 6 flashes** | Motor circuit failure — the board is the usual replacement, not the motor | Stop using it | Call a pro |
| **UP/DOWN arrows: 1-1, 1-2, 1-4 or 4-6** | Sensor circuit family on Security+ 2.0 — open, shorted, reversed, or momentarily interrupted | Fix today | Either — call us if unsure |
| **UP/DOWN arrows: 1-3** | Wall control wiring shorted | Fix this week | Either — call us if unsure |
| **UP/DOWN arrows: 1-5** | No RPM detected in the first second of movement | Stop cycling it | Call a pro |
| **UP/DOWN arrows: 1-6** | Door drifted down after opening — or the manual release is still pulled | Check the release first | Start with you |
| **UP/DOWN arrows: any 2-x, or 3-3** | Logic board fault | Power-cycle once, then call | Call a pro |
| **UP/DOWN arrows: 3-2** | Power outage — the opener has lost its travel position | Clears itself | You can do this |
| **UP/DOWN arrows: 3-5** | Cable tension monitor tripped or missing — slack in the lift cable | Stop using it | Call a pro |
| **UP/DOWN arrows: 4-1, 4-2, 4-3 or 4-4** | The door fought back mid-travel — balance, spring, rollers, limits or drive slip | Fix this week | Call a pro |
| **Even, continuous flashing with a beep** | Unattended close warning from a timer or an app command | No action needed | You can do this |
| **Irregular flicker with no rhythm** | Failing bulb or a cheap LED driver — not a code at all | Whenever | You can do this |
| **No light, no flashing, no response** | No power reaching the opener at all | Fix today | You can do this |

## What’s actually causing it

These are ordered the way we work through them on a real service call — cheapest and most common first, so you don’t start by replacing a part that was never the problem.

1

### The sensor circuit is open — a cut, loose or disconnected wire

Hands-on — moderate risk

This is code 1-1 on a Security+ 2.0 unit, one flash on an older LED, and it's one of the conditions behind the ten-flash bulb signal. The opener sent voltage down the safety sensor pair and nothing came back. The most common physical reasons are a wire that has backed out of its terminal screw at the powerhead, a conductor nicked by a shelf bracket or a staple gun, or a connection that has corroded at a splice. Rodents chew this wire too — it's thin, it runs along the wall at exactly the wrong height, and it tastes no worse than anything else in a garage.

How you can tell: On a LiftMaster, both sensor LEDs dark points here. Amber off and green off is the classic reading for a cut or disconnected wire, or sensors that were never wired in at all.

The fix

1.  Get a ladder and look at the low-voltage terminal strip on the opener. Confirm each sensor wire is fully under its screw and that no stray strand is bridging to the neighboring terminal.
2.  Chamberlain's own spec is 7/16 inch of insulation stripped back. Less than that and the screw bites insulation instead of copper.
3.  Give each wire a light tug at the terminal. A wire that slides out was never landed properly.
4.  Trace the run from each sensor back along the wall, looking for staple punctures, kinks, crush marks behind shelving, or green corrosion at any splice.
5.  Flex the wire gently every foot or so while someone watches the sensor light. A flicker locates the break.
6.  If you want to prove it's the wire rather than the sensor, temporarily wire a sensor to the opener with a short length of fresh wire. If it comes to life, the run is the problem.

You’ll know it’s right when: Both sensor lights come on and hold steady, and the flashing stops.

**Where to stop:** Splicing a low-voltage pair is well within reach for most people. Running new wire inside a finished wall, or working out which terminal is which on an unlabelled board, is where it stops being worth it — a wire landed on the wrong terminal can take out the logic board, which is the priciest single part in the unit.

2

### The sensor pair is shorted, or the wires are reversed

Hands-on — moderate risk

Code 1-2 on Security+ 2.0, two flashes on an older LED. The opposite complaint to an open circuit: instead of seeing nothing, the opener sees the two conductors touching, or sees them the wrong way round. A staple driven through the jacket is the classic short, because it pierces both conductors and bonds them. Pinching the wire between a shelf bracket and a stud does the same thing more slowly, as the insulation cold-flows under pressure.

Reversed wires are their own story and they're very common in pre-wired homes, where the sensor leads were run inside the wall by a builder and joined behind the drywall. Get the pair backwards at either end and you get this code with everything otherwise perfect.

How you can tell: The code persists no matter what you do at the sensor faces. Frequently it starts right after someone hung something on the garage wall — or right after a new opener went onto old house wiring.

The fix

1.  Check polarity at both ends first, because it's free. On Chamberlain-family units the plain white wire lands on the white or #2 terminal, and the white-with-black-stripe wire lands on the gray or #3 terminal. Same colors at the sensors.
2.  If the house is pre-wired, pull the wires out from behind the wall next to each sensor and confirm the same color is on the same side at both ends.
3.  Disconnect one sensor at the terminal strip and see whether the code changes. Then reconnect it and disconnect the other. Whichever one clears the fault is the branch with the problem.
4.  Inspect that branch closely for staples, screws, nails, or anything driven near the wire run.
5.  Look at where the wire enters each sensor housing — the strain point right at the entry is a common failure spot.
6.  If both branches are clean and the fault follows one specific sensor, that sensor has failed internally. Replace sensors as a matched pair rather than one at a time.

You’ll know it’s right when: The code clears, both indicators light, and the door closes without the override.

**Where to stop:** If the short is inside a wall or above a finished ceiling, leave it. Pulling a new run through existing framing goes quickly for someone who does it weekly and badly for someone doing it once.

3

### The sensors are marginally out of aim, or the beam was clipped in passing

Basic check

Code 1-4 on Security+ 2.0, four flashes on an older LED. The opener can see the beam, but the signal is weak, unstable, or dropped out momentarily during travel. Chamberlain draws the line at four seconds: an interruption shorter than that lands here, longer than that lands in the open-circuit family.

Sometimes this code means nothing is wrong at all. If somebody walked through the doorway while the door was closing, the opener did exactly what it should and logged it. What makes it a real fault is when it keeps happening with nobody near the door — which points at brackets that flex as the door cycles, or an aim that's close to right but not quite.

How you can tell: Both sensor lights appear lit, but the receiving one flickers slightly, especially while the door moves. The door often works some cycles and refuses others with no clean pattern.

The fix

1.  Loosen the bracket wing nut just enough that the sensor pivots under light finger pressure. There's no need to remove anything.
2.  Clean both lens faces with a soft dry cloth first. Dust films them here in a way that's genuinely invisible until you look at the cloth.
3.  Aim each eye straight across at its partner and hunt for the center of the good zone rather than the edge — sweep past the point where the light goes steady, then come back to the middle of that range.
4.  Snug the bracket down while holding the aim, then check the light didn't shift as you tightened.
5.  Watch the sensor indicator through a full cycle. A flicker as the door passes means a bracket is flexing or the wire is being tugged.
6.  Check both brackets are firmly fastened, and that the track itself is secured to the wall and doesn't move when you press it. A bracket that moves won't hold aim.

You’ll know it’s right when: Both lights hold rock steady through a complete open and close, and the code is gone.

**Where to stop:** Little risk in any of this. If you can't find an aim that holds, the bracket is likely bent or the sensor is failing, and swapping the pair is straightforward.

4

### The wall control circuit is shorted

Hands-on — moderate risk

Code 1-3 on Security+ 2.0, three flashes on an older LED, six blinks on a Genie Excelerator. This one points at the other pair on the terminal strip: the two wires running to your wall button. When they short, the opener sees a permanently pressed button. The usual culprits are a staple through the wire, exposed conductor at the terminal screws, a console whose contacts have jammed, or damage from drywall work near the run.

How you can tell: Remotes and the keypad still work, but the wall console does nothing — and its LED or screen is usually dark.

The fix

1.  Disconnect the two wall control wires at the opener terminal strip. If the code clears immediately, the fault is downstream in the console or its wiring.
2.  With those wires off, try a remote. A door that now works normally confirms the diagnosis.
3.  Pop the console off the wall — the screw is under the push bar or under the buttons — and check for corrosion, a swollen button membrane, or a wire pinched behind the backplate.
4.  Check the strip length at both ends. Exposed conductor sitting proud of the screw is enough to short the pair.
5.  Follow the wire run for staples and nail strikes, especially anywhere someone has hung shelving, a hose reel, or a TV bracket.
6.  If the console itself is the fault, replacing it is a small job — but multi-function consoles have to match the opener generation.

You’ll know it’s right when: The code stops and the wall button works with a clean positive response.

**Where to stop:** A note on the old technique of touching the two console wires together to test: that does not work on Security+ 2.0 openers, and bridging terminals on a live board is not something we'd point a homeowner at. If the console is dark and swapping it doesn't fix it, hand the wiring to us.

5

### No rotation detected — the opener started and the shaft didn't turn

High risk — call a technician

Code 1-5 on Security+ 2.0, five flashes on an older LED. This is the code most often misread, because it sounds like a motor fault and usually isn't one. What the opener is actually reporting is narrow and specific: it commanded movement and saw no rotation in the first second.

Chamberlain's own guidance treats this as a mechanical stoppage first. The list of causes reads like a list of door problems, not opener problems: a door that's out of balance, a broken spring, a manual side lock still thrown, a trolley jammed against the rail stop bolt. Only after those does it get to the capacitor, the gears, the RPM sensor, and an overheated motor. That ordering matters, because chasing it as an electronics fault means buying a part you didn't need while a broken spring sits above your head.

How you can tell: How it behaves narrows it fast. Humming under five seconds, humming for longer, a single click with no movement, or moving six to eight inches and stopping are four different diagnoses on the manufacturer's own chart. Note which one yours does before you call anyone.

**Where to stop:** This is where we'd rather you stopped, and not for liability theater. The number one cause on the manufacturer's own list is a door that isn't balanced or a spring that's broken — and a broken torsion spring is the single most dangerous component in a residential garage. Diagnosing it means putting hands on a door whose counterbalance is unknown. Tell us what the opener did and how long it hummed, and we'll arrive already knowing which half of the chart we're on. Half the diagnostic work is done before the [garage door opener repair](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-motor-opener-repair-replacement-installation/) even starts that way.

6

### The door drifted down after opening — or the release is still pulled

Hands-on — moderate risk

Code 1-6 on Security+ 2.0, and worth knowing about because one of its two causes is free to fix. The opener is reporting that it detected rotation *after* the motor shut off at the open position. In other words: it parked the door, then something turned the shaft.

The cheap version is that the manual release is still pulled. Somebody disconnected the door during a power outage, reconnected the power but not the trolley, and now the door is hanging on its springs with nothing holding it. On wall-mount openers you'll also see this code simply from operating the door by hand.

The other version is that the door is genuinely drifting — the counterbalance no longer holds it at the top. That's a spring that has lost tension or is on its way out, and it's the reason this code shouldn't be ignored just because the door still works.

How you can tell: The door opens normally, sits for a moment, and then creeps down an inch or two on its own. Or the opener runs but the door never moves, because the trolley isn't connected to anything.

The fix

1.  With the door CLOSED, look at the trolley on the rail and the red release cord. If the release is disengaged, close the door fully first, then re-engage it by pulling the cord toward the door or running the opener until the trolley relatches, depending on your model.
2.  Never re-engage the release with the door open. A door held only by a worn spring can come down when the trolley catches.
3.  Once reconnected, run one full open-and-close cycle to clear the code.
4.  If the release was already engaged, the code is telling you the door won't hold position. Stop using it and book a balance check.

You’ll know it’s right when: The trolley is latched, the door holds where the opener parks it, and the code doesn't return after a full cycle.

**Where to stop:** If the release was connected the whole time, this is a counterbalance problem and it's ours. A door that won't stay up is a door that's already telling you the springs aren't carrying their share.

7

### Logic board and power-related codes

High risk — call a technician

This family covers 2-1 through 2-5 and 3-3 on Security+ 2.0, six flashes on an older LED, and one or two blinks on a Genie Excelerator. The opener has run a check on its own electronics and found something wrong.

Two of these are worth trying once yourself, because they cost nothing. Chamberlain's instruction for the 2-x family is to disconnect the backup battery if there is one, unplug the opener, and plug it back in — a genuine one-off glitch will clear and not return. Code 3-2 isn't a fault at all: it means the opener lost power and needs to relearn where the door is, and one full open-and-close cycle clears it.

The rest are parts. Six flashes on an older unit is a motor circuit failure, and Chamberlain's own guidance is to replace the logic board rather than the motor, because the motor itself rarely fails. Code 3-3 is battery over-voltage and is also a board.

How you can tell: The code repeats from cold after the unit has been left overnight, and a power cycle doesn't shift it. The light may still work perfectly while nothing else does.

**Where to stop:** Leave this one with us, for two reasons. First, capacitors hold a charge after the unit is unplugged, and a capacitor that looks discharged isn't the same as one that is. Second, this is the code where the honest answer is sometimes that the repair isn't worth doing. On a unit past fifteen years, a board can cost enough that a new opener is the better spend, and we'd rather tell you that than fit an expensive part into a tired machine.

8

### Steady flashing that isn't a code at all

Basic check

Not every flashing light is a fault. Openers flash steadily as an advance warning before an unattended close — a timer-to-close feature, or a command sent from an app — and units with battery backup flash to report battery condition. Neither has a group-and-pause rhythm, which is the giveaway.

There's a related trap on Security+ 2.0 units: code 5-5 means an unattended open or close command arrived but no compatible work light is installed and programmed. People read that as a broken opener when it's actually a missing accessory the feature depends on.

And the newest wrinkle is the opposite problem. On openers and logic boards manufactured after February 3, 2022, Chamberlain removed the ten-flash light signal. So a modern opener can refuse to close and say nothing at all, and people conclude the diagnostics are broken. They aren't — the message moved to the powerhead.

How you can tell: The door behaves normally, or refuses to close in complete silence. Either way there's no countable group of flashes separated by a pause.

The fix

1.  Watch for thirty seconds without touching anything. Groups with a pause are a code; even continuous flashing is not.
2.  Check your timer-to-close setting and any app automations before assuming anything is broken.
3.  If the unit has battery backup, check the battery indicator separately — a battery reporting its age looks alarming and means very little.
4.  Swap the bulb if the flicker has no rhythm at all. A failing LED driver mimics a fault convincingly.
5.  If the door won't close and nothing flashes, go and look at the sensor LEDs directly rather than waiting for the opener to tell you.

You’ll know it’s right when: You can explain the flashing without reference to a fault code, and the door does what you ask it to.

**Where to stop:** Nothing risky here. If the door won't close and you can't find any indicator anywhere, that's worth a call — a silent refusal on a newer opener still has a cause.

## What your opener is telling you, by brand

### LiftMaster & Chamberlain — Security+ 2.0 (UP and DOWN arrows)

For openers built from about 2011 with a yellow Learn button and UP/DOWN adjustment arrows on the powerhead. Read it as two digits: count the UP flashes, then the DOWN flashes, then wait for the pause and confirm you got the same pair twice.

| Code | What the opener is reporting | Your first move |
| --- | --- | --- |
| **1-1** | Safety sensors obstructed, misaligned, disconnected or a broken wire — held for more than four seconds | Look at the two sensor LEDs. Amber off and green off points at wiring; amber solid and green off or flickering points at aim or an obstruction |
| **1-2** | Sensor wires reversed, or shorted between the white and black terminals | Check white-to-white and black-to-black at both the sensors and the powerhead, then hunt for a staple through the pair |
| **1-3** | Wall control wires shorted for more than four seconds | Pull those two wires off the terminal strip and see whether the code clears. Remotes usually still work while the wall button does nothing |
| **1-4** | Sensors were obstructed or misaligned for less than four seconds — something passed through the beam | If it was somebody walking through, nothing is wrong. If the green LED flickers slightly, the aim is marginally off |
| **1-5** | No RPM detected in the first second of movement | Note exactly what the opener did — moved a few inches and stopped, hummed briefly, hummed a long time, or only clicked. Each points somewhere different |
| **1-6** | Rotation detected after the motor shut off at the open position — the door drifted down | Check whether the manual release is still pulled. If not, the door needs a balance test |
| **2-1 to 2-5** | Logic board component failure | Disconnect the backup battery if fitted, unplug and replug the opener. If the code returns, the board is the part |
| **3-2** | The opener lost power and needs to relearn where the door is | Check the outlet, then run one full open and close to clear it |
| **3-3** | Battery over-voltage detected — logic board fault | Board replacement. The battery indicator usually flashes green constantly alongside it |
| **3-5** | Cable tension monitor tripped or not detected — slack in the lift cable | Stop using the door. Slack cable on a wall-mount opener is a mechanical problem, not an electronics one |
| **4-1** | Unexpected change in RPM or motor current on the way DOWN | The list here is almost all door: balance, a broken spring, worn rollers or hinges, an obstruction, an uneven floor, or a down limit set too far |
| **4-2** | Unexpected change in RPM or motor current on the way UP | Same family — balance, spring, rollers, hinges, alignment, or an up limit set past the stop bolt |
| **4-3 / 4-4** | Loss of RPM during travel down or up | Usually a loose travel module or its wiring harness. On a wall-mount unit, 4-4 can also mean the emergency release was pulled mid-travel |
| **4-5** | Travel module not recognized | The wrong module is fitted for that opener |
| **4-6** | A 1-1 or 1-2 sensor condition was already present and the opener was told to close | Work the sensor wiring exactly as you would for 1-1 or 1-2 |
| **5-5** | An unattended open or close command arrived with no myQ work light installed or programmed | Timed and app-triggered closes need a compatible light installed and programmed before the opener will act on them |

### LiftMaster & Chamberlain — older AC units (LED next to the Learn button)

For AC-powered openers without UP/DOWN arrows. One number of flashes, then a pause, then a repeat. Craftsman openers were largely built in the same factories and follow this chart too.

| Flashes | What the opener is reporting | Your first move |
| --- | --- | --- |
| **1** | A broken or disconnected wire to a safety sensor | Check the terminal screws first, then walk the wire run looking for cuts and staples |
| **2** | A sensor wire is shorted, or the black and white wires are reversed | Confirm white to the white terminal and black-and-white to the gray terminal, then look for staples |
| **3** | Wall control circuit fault — the console LED or screen is usually dark | Inspect the console wire for a staple. Note that shorting the terminals to test does not work on Security+ 2.0 units |
| **4** | Sending sensor is steady, receiving sensor is dim or flashing — the beam is weak | Clean the lens, loosen the wing nut, and re-aim until the receiving LED glows steadily |
| **5** | No rotation detected in the first second — a mechanical stoppage, not necessarily a bad motor | Note how it behaves: humming under five seconds, humming longer, a single click, or moving six to eight inches. Each narrows it down |
| **6** | Motor circuit failure | Chamberlain's own guidance is to replace the logic board, because the motor itself rarely fails |

### The ten-flash light signal (not a numbered code)

Worth its own row because it's the single most-searched opener symptom and it gets mixed up with the numbered charts constantly. This is the light bulbs, not a diagnostic LED.

| What you see | What it means | Your first move |
| --- | --- | --- |
| **Bulbs flash about ten times, door won't close** | The opener was told to close and the safety sensor circuit did not check out | Look at the sensor LEDs, clear the beam path, wipe both lenses, re-aim |
| **Opener clicks about ten times instead** | Same signal on a unit with no bulbs installed — it clicks the light relay | Treat it identically to ten flashes |
| **Door won't close and nothing flashes at all** | On openers and logic boards built after February 3, 2022, this signal was removed | Read the numbered code on the powerhead instead, and check the sensor LEDs directly |

### Genie — Safe-T-Beam sensor indicators

Genie splits its diagnostics across two separate charts, and this is the one people need most. Read the LEDs on the sensor housings: the **source** unit carries the red LED and is the one that blinks codes; the **receiver** carries the green LED.

| Red LED (source) | Green LED (receiver) | What Genie is reporting, and what to do |
| --- | --- | --- |
| **On** | On | Normal operation. Nothing needed — look somewhere other than the sensors |
| **Off** | Off | The powerhead has no power, or the wiring from it is bad. Check breakers, fuses and plugs, then look for obvious shorts |
| **Off** | On | Wiring to the source is missing or bad, or power was interrupted. Check the wiring, then remove and reapply power |
| **2 blinks, pause, repeat** | On | Beam misaligned, obstructed, or a defective sensor. Clear the path and re-aim the source |
| **2 blinks, pause, repeat** | Off | The wire to the receiving sensor is missing or bad, or that sensor is defective. Check the wiring |
| **3 blinks, pause, repeat** | On | The sensor is picking up interference. Track down the source — low afternoon sun is the usual one here |
| **4 blinks, pause, repeat** | On | The source isn't sending pulses and is likely defective. This is a replacement, not an adjustment |

### Genie — Excelerator powerhead status LED

A separate chart from the Safe-T-Beam one above, and a separate light. The status LED sits under the lens cover on Excelerator-series screw drive models (H8000, H8000-07, H8000D, ISD990, ISD995, ISD1000, PRO99, PRO99-21C, PRO99FN, CMD9900). Green comes on then off at power-up; if it stays on solid, that's a call to Genie, not a code.

| Blinks | What Genie is reporting | Your first move |
| --- | --- | --- |
| **1** | Motor drive board interrupt — often triggered by the automatic balance detection system | Unplug for five seconds and retry. If it recurs, the door itself is the suspect: balance, worn spring, binding hardware or rollers |
| **2** | Controller board interrupt | Power-cycle, then check the ribbon cable between the motor drive board and the controller board |
| **3** | Overheated or over-cycled | Do NOT unplug it. Wait ten minutes — cycles are restored at five per ten-minute rest |
| **4** | Force settings incorrect | Check the force settings. They aren't preset at the factory, so a new install often lands here |
| **5** | Safe-T-Beam malfunction | Go to the Safe-T-Beam chart above. The door will not close until that system is working |
| **6** | Wall console not working | Check the console wiring for shorts, tight staples and pinched wire, and the connections at both ends |
| **7** | Limit switches not working | Check the limit switch wiring at the powerhead terminals and for pinched wire under the switch brackets |
| **8** | Wall console is locked | The vacation lock switch on the console is set to Lock. Unlock it |

### Craftsman and pre-diagnostic units

Most Craftsman openers came out of Chamberlain factories and follow the single-LED chart above. Genuinely old units often have no diagnostic output whatsoever, and you work by elimination instead.

| What you've got | What that means for diagnosis | How to proceed |
| --- | --- | --- |
| **A Learn button and a flashing diagnostic LED** | Chamberlain-built, single-count codes apply | Use the older AC table above |
| **No flashing, no diagnostic light** | Predates the code era | Read the sensor indicators directly and split the problem with the hold-the-button test |
| **Dip switches in the remote** | Fixed-code unit from before rolling codes | No codes exist to read — diagnose by substitution |
| **No photo eyes at the floor at all** | Built before entrapment protection was required | Worth a serious conversation about replacing it |

## What you’ll need if you’re doing this yourself

-   **A phone camera** — record the flashing and count it back frame by frame — far more reliable than counting live
-   **A stepladder** — the terminal strip and the diagnostic LEDs are on the powerhead
-   **A flashlight** — terminal labels are molded into dark plastic and nearly unreadable in a dim garage
-   **A small flat screwdriver** — for the low-voltage terminal screws and the light cover
-   **A soft dry cloth** — for sensor lenses — no solvents, they haze the plastic
-   **Your opener manual, or the model number** — the number on the sticker tells you which diagnostic scheme your unit uses

## Things not to do — and why

× Don't count across the pause

Codes repeat in groups, and running two groups together is how a four becomes an eight. Count one group, wait for the gap, count the next, and only act when you get the same number twice.

× Don't assume every flash is a fault

Steady even flashing is usually the unattended-close warning or a backup battery status report. Chasing a fault that doesn't exist wastes an afternoon and sometimes ends with someone disabling a feature they wanted.

× Don't clear a code by unplugging and calling it fixed

A power cycle clears the display, not the fault. The code was a report on a real circuit, and it will be back on the next cycle — usually at a less convenient moment.

× Don't bypass the sensors because the code annoys you

More diagnostic codes point at that circuit than at anything else on the opener. Since 1993, federal rules (16 CFR Part 1211) have required every residential opener made in the US to have secondary entrapment protection — in practice that means photo eyes, which is what essentially every manufacturer fits, and defeating them removes the only thing that stops a closing door on a child or a pet.

× Don't keep triggering a five or six code to see if it clears

Those are motor codes. Every repeat attempt puts more heat into windings that are already complaining, and winding damage accumulates rather than heals.

× Don't land sensor wire on a terminal you're guessing at

The low-voltage strip has more than one pair on it, and putting the sensor wire on the wall control terminals can take the logic board with it. If the labels are unreadable, photograph the wiring before you disturb anything.

× Don't ignore a code that only appears seasonally

A sensor code that shows up every July and vanishes in October isn't random. Heat moves brackets, and that's a real fault with a real fix rather than something to work around twice a year.

## The codes we see most in the Phoenix area

Blink codes are the same everywhere, but the distribution isn't. Running service calls around Mesa, Gilbert and Chandler, we see a very lopsided mix compared with what the code list would suggest, and the reasons are all climate.

Sensor codes dominate — the tens and fours especially. Fine monsoon silt films the lenses without ever looking like dirt, low winter sun floods the receiving eye in the late afternoon, and a garage that swings between 60°F in January and 130°F under the ceiling in July moves every bracket in the building by a small amount, twice a year. A few degrees of drift is all it takes.

-   **Ten flashes after a dust storm** — silt on the lens scatters the beam long before the lens looks dirty. Add both lenses to your post-monsoon walkaround.
-   **Four flashes that arrive in summer** — heat expansion walks a marginal bracket out of its steady zone. Aim for the middle of the good range, not the edge of it, and it survives the season.
-   **Rotation and current codes on August afternoons** — the opener hangs in the hottest air in the building, often past 130°F, and a door that has stiffened up in the heat gives it a load it wasn't sized for.
-   **One and two flashes after monsoon season** — humidity gets into splices and terminal screws, and corrosion reads as an open or a short depending on how far it has gone.
-   **Codes that cluster after a storm** — surges damage logic boards, and a board that came through a hit half-intact throws odd codes for months afterwards. A surge protector on the opener circuit is cheap insurance here.
-   **Motor codes on a door that got heavy** — our own call history says springs retire early in this valley, and DASMA adds a specific reason: a door left standing open exposes its springs to far more temperature and moisture swing than a closed one, and what that looks like on the ground here is springs falling short of the ten years a mild climate would give them, so springs weaken sooner in this climate and the motor picks up the difference. We test balance by hand on every motor-code call for exactly that reason.

## Fewer codes next year

Most of what makes an opener flash is preventable, and none of the prevention takes long.

-   **Photograph your terminal strip while it's working** — a clear picture of which wire lands where turns a future one-or-two-flash fault into a five-minute job instead of a guess.
-   **Wipe both sensor lenses twice a year** and always after a dust storm. This alone prevents a large share of ten codes.
-   **Aim sensors for the middle of the steady zone** rather than the first point where the light comes on. The margin is what survives a summer of thermal movement.
-   **Keep the wire runs out of harm's way** — before hanging shelving, a hose reel or a bike rack, check where the sensor and console wires run behind the drywall you're about to shoot fasteners into.
-   **Lubricate the door annually** with a silicone or lithium garage-door product. Less friction means less motor current, which means fewer five codes on hot days.
-   **Fit a surge protector on the opener circuit** — monsoon surges are the most common cause of boards that start reporting nonsense.
-   **Write your Learn button color and model number somewhere findable** — it saves a ladder trip every time you need to look up which diagnostic scheme your unit uses.

## What a code often turns out to be

Codes report circuits, but the underlying story frequently starts in the door rather than the opener.

[Spring fatigues in the heat](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-spring-broke/)

→

[Door gets heavy](https://farnsworthgarage.com/garage-door-troubleshooting/garage-door-too-heavy-to-lift/)

→

Motor works harder, throws a rotation or current code *(you are here)*

→

[Opener overheats regularly](https://farnsworthgarage.com/garage-door-opener-troubleshooting/garage-door-opener-overheating/)

→

[Drive gear strips](https://farnsworthgarage.com/garage-door-opener-troubleshooting/garage-door-motor-runs-door-doesnt-move/)

This is why a motor-family code is worth acting on early. It's the cheapest warning you'll get in that sequence, and everything after it costs more.

## When to hand it over

Call us for any no-rotation code (1-5 or five flashes), any logic-board code, a cable tension monitor code, a sensor code that traces into a wall, a door that has operated by itself, or a code that cleared but you never found out why. That last one matters more than people think — a fault that fixed itself usually didn't.

What we do on a visit for this

-   Read every code the unit is reporting and interpret it against your exact model rather than a generic table
-   Meter the sensor and wall control circuits end to end instead of guessing at where the break is
-   Check the terminal strip for backed-out conductors, stray strands, and heat damage
-   Test motor current draw under load, which is the number that actually explains a rotation or current code
-   Release the door and check balance by hand, since motor codes are so often a spring story
-   Inspect and lubricate rollers, hinges, bearings and track while we're on the ladder anyway
-   Run the safety reversal test the way UL 325 requires and show you the result
-   Give you a straight answer on repair versus replacement if the board or motor has failed

Same-day service is our standard across Mesa, Gilbert, Chandler, Queen Creek, Scottsdale, Tempe, Phoenix and the rest of the Valley.

The service that fixes this

When you want it handled rather than diagnosed, this is the page for it: [garage door opener repair](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-motor-opener-repair-replacement-installation/).

## What a code costs to resolve

The code itself tells you a lot about which end of the range you're in, which is one more reason to count it properly before calling anyone. Here's what actually moves the number.

-   **Which code it's** A four is usually an alignment and a conversation. A six is a motor or board. Those aren't remotely the same job. The code you're reading is the best predictor of what a [garage door opener repair](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-motor-opener-repair-replacement-installation/) will involve.
-   **Whether the wiring is accessible** A break we can see and splice is quick. A run chewed through inside a finished wall means pulling new cable, and that takes real time.
-   **Whether sensors need replacing** Photo eyes are replaced as a matched pair, not singly — mixing generations produces intermittent faults that cost more to chase than the part saved.
-   **Whether the logic board survived** The board is the most expensive component in most openers, and surge damage isn't always obvious until it's metered.
-   **Whether the real cause is the door** If a motor code traces back to weak springs, you're looking at spring work, and wire size, length and cycle rating all feed into that.
-   **The age of the unit** Past fifteen years, an expensive part in a tired machine is often a worse spend than a replacement, and we'll say so.

You'll get a written quote before any work starts. If you're due anyway, our full tune-up is $39.99 — same price in every city we serve.

## Still stuck? We’ll come take a look.

Same-day service is our standard across Mesa, Gilbert, Chandler, Queen Creek, Scottsdale, Phoenix, and the rest of the Valley.

[Call (602) 935-9766](tel:+16029359766) [Book an appointment](https://farnsworthgarage.com/book-appointment-now/)

Due for a check-up while we’re out? Our full tune-up is **$39.99** — same price in every city we serve.

## Related problems we see with this one

[Garage Door Sensor Not Working Read the fix →](https://farnsworthgarage.com/garage-door-opener-troubleshooting/garage-door-sensor-not-working/) [Garage Door Won’t Close Read the fix →](https://farnsworthgarage.com/garage-door-opener-troubleshooting/garage-door-wont-close/) [Garage Door Opener Beeping Read the fix →](https://farnsworthgarage.com/garage-door-opener-troubleshooting/garage-door-opener-beeping/) [Genie Safe-T-Beam Lights Explained Read the fix →](https://farnsworthgarage.com/garage-door-opener-troubleshooting/genie-safe-t-beam-codes/)

## Look up your exact opener

Diagnostic codes, programming steps, and learn-button colors all change by brand and by model. We keep a page for every opener we service — pick your brand below, find your model in the list, and its page has the diagnostic codes, the programming guide, and the manufacturer’s manual.

Your model number is on a sticker on the side or back of the motor housing, and it’s usually printed on the inside of the light cover too.

[LiftMaster Find your model →](https://farnsworthgarage.com/garage-door-opener-options/liftmaster/) [Chamberlain Find your model →](https://farnsworthgarage.com/garage-door-opener-options/chamberlain/) [Genie Find your model →](https://farnsworthgarage.com/garage-door-opener-options/genie/) [Marantec Find your model →](https://farnsworthgarage.com/garage-door-opener-options/marantec/) [Sommer Find your model →](https://farnsworthgarage.com/garage-door-opener-options/sommer/) [Linear / Nice Find your model →](https://farnsworthgarage.com/garage-door-opener-options/linear/)

**Straight to a model page:** [LiftMaster 2420L](https://farnsworthgarage.com/garage-door-opener-options/liftmaster/2420l/) · [Chamberlain B4603T](https://farnsworthgarage.com/garage-door-opener-options/chamberlain/b4603t/) · [LiftMaster 87802](https://farnsworthgarage.com/garage-door-opener-options/liftmaster/87802/)

## Questions we get asked about this

### What does it mean when my garage door opener light blinks?

It depends which light. If the light *bulbs* flash about ten times, that's a fixed LiftMaster and Chamberlain message meaning the safety sensor circuit didn't check out and the close was refused. If a small LED next to the Learn button flashes a number and pauses, that's a diagnostic code. If a pair of UP and DOWN arrows flash, that's a two-digit code and a different chart entirely. Steady flashing with no grouping is usually a warning before an unattended close, not a fault at all.

### What does 10 blinks mean on a LiftMaster?

Ten flashes of the light bulbs is the sensor refusal signal, and it's the one we see more than any other. It doesn't distinguish between causes — blocked beam, misaligned eyes, a cut wire, a short, or reversed wires all produce the same ten flashes. Clear the floor between the sensors, wipe both lens faces, and re-aim until both indicator lights sit rock steady. If your opener has no bulbs fitted, you'll hear it click ten times instead.

### What is a two-digit garage door opener code?

It's what Security+ 2.0 openers use — generally a yellow Learn button, built 2011 or later, with UP and DOWN adjustment arrows on the powerhead. The UP arrow flashes a few times, then the DOWN arrow flashes a few times, then it pauses and repeats. One UP and five DOWN is code 1-5. The numbers don't line up with the older single-count system, so reading a two-digit code against an old chart gives you the wrong answer.

### What does 5 blinks mean on a garage door opener?

On an older single-LED opener, five flashes means the opener detected no rotation in the first second of movement. That sounds like a motor fault and usually isn't one — Chamberlain's own troubleshooting puts mechanical stoppage first: a door out of balance, a broken spring, a manual lock still thrown, or a trolley jammed against the rail stop bolt. Note whether it hums briefly, hums a long time, only clicks, or moves six to eight inches, because those are four different diagnoses.

### What does code 1-6 mean on a LiftMaster?

It means the opener detected rotation after the motor shut off at the open position — the door drifted down on its own. There are two causes and one of them is free. Check whether the manual release is still pulled: if somebody disconnected the door during a power outage and never reconnected the trolley, this is the code you get. If the release is engaged and the door still creeps down, the counterbalance isn't holding and the springs need looking at.

### Why doesn't my newer opener flash anything when it won't close?

Because Chamberlain removed that feature. Any garage door opener or replacement logic board manufactured after February 3, 2022 no longer flashes the lights ten times for a sensor refusal. The diagnostic information moved to the powerhead indicators instead. So a modern opener can sit there in silence refusing to close — read the numbered code on the unit, and look at the sensor LEDs directly.

### How do I count garage door opener blink codes correctly?

Trigger the fault, then watch for the rhythm rather than the total. Codes come in groups separated by a distinct pause. On a two-digit unit, count the UP arrow flashes, then the DOWN arrow flashes, then wait through the pause and confirm you got the same pair. Filming it on your phone and stepping through the video is far more reliable than counting live — people routinely turn four blinks into ten by counting across the pause.

### Does Genie use blink codes?

Yes, on two separate charts. The Safe-T-Beam sensors report through LEDs on the sensor housings: the source unit carries the red LED and does the blinking, the receiver carries the green one. Two blinks means misaligned or obstructed, three means interference, four means the source isn't sending. Separately, Excelerator-series screw drive models have a status LED under the lens cover on the powerhead running its own one-to-eight chart. Don't read one against the other. Tell us which chart you were reading and the [garage door opener repair](https://farnsworthgarage.com/garage-door-repair-service-installation/garage-door-motor-opener-repair-replacement-installation/) starts from the right one.

### Can I clear a blink code by unplugging the opener?

You can clear the display, but not the condition. The code reports a circuit the opener checked and didn't like, so cutting power just resets the messenger. The exception is the logic-board family — Chamberlain specifically tells you to disconnect the backup battery, unplug, and replug for those, because a genuine one-off glitch will clear and not return. If the code comes back, it was never a glitch. And on a Genie Excelerator showing three blinks, do *not* unplug it: that code is an over-cycle timer that restores itself as you wait.

### Which blink codes mean the sensors are bad?

On a two-digit unit: 1-1 is an open circuit or blocked beam held over four seconds, 1-2 is a short or reversed wires, 1-4 is a brief interruption or marginal aim, and 4-6 means a sensor problem was already present when you asked it to close. On an older single-LED unit, one, two and four cover the same ground. The distinction matters because an open circuit and a short send you to opposite ends of the same wire.

### Why does my opener only throw a code in the afternoon?

Almost always low sun flooding the receiving photo eye and drowning out the infrared signal it's looking for. Genie even has a dedicated code for it — three blinks on the red source LED means the sensor is picking up interference. It's common on west-facing garages here, and worse in winter when the sun sits lower. A small hood over that sensor, or swapping the two eyes side for side so the receiver faces away from the sun, usually ends it permanently.

### My opener blinks 6 times. Can I fix that myself?

On an older single-LED unit, six flashes reports a motor circuit failure, and Chamberlain's own guidance is to replace the logic board rather than the motor, because the motor itself rarely fails. There's no adjustment that clears it, and capacitors hold a charge after the unit is unplugged. It's also the code where the honest answer is sometimes that a fifteen-year-old opener isn't worth the board. Note that six blinks on a Genie Excelerator means something completely different — a wall console fault.

### Should I be worried if the code goes away on its own?

Mildly, yes. Intermittent codes usually mean an intermittent connection — a wire with a partly broken conductor that makes and breaks contact as the garage heats up and cools down, or a terminal screw that's not quite tight. Those get worse rather than better, and they're much easier to find while they're still repeating than after they settle into failing permanently.

### What is code 3-5 on a wall-mount opener?

It's the cable tension monitor — a switch that watches for slack in the lift cable on wall-mount and jackshaft openers. Either it has tripped, it isn't installed, or its wire is broken. Slack cable is a mechanical problem rather than an electronics one, and a cable that has come off its drum can let a door drop. If you're seeing 3-5, stop using the door and call someone rather than resetting it.

### Where this information comes from

-   [Chamberlain Group — Diagnostic Codes for Garage Door Openers (Security+ 2.0, UP/DOWN arrows)](https://support.chamberlaingroup.com/s/article/Garage-Door-Opener-Diagnostic-Codes) — the manufacturer's two-digit code chart, 1-1 through 5-5
-   [Chamberlain Group — What Does the Flashing LED Next to the Learn Button Mean](https://support.chamberlaingroup.com/s/article/What-does-the-flashing-LED-next-to-the-learn-button-mean-1484145519298) — the single-count 1 through 6 chart for older AC-powered units
-   [The Genie Company — Safe-T-Beam System Self Diagnostic Troubleshooting](https://store.geniecompany.com/pages/genie-safe-t-beam-system-self-diagnostic-troubleshooting) — Genie's sensor-housing LED chart (red source, green receiver)
-   [The Genie Company — Excelerator Series Self-Diagnostic Troubleshooting](https://store.geniecompany.com/pages/genie-excelerator-series-garage-door-opener-self-diagnostic-troubleshooting) — the separate powerhead status LED chart, 1 through 8 blinks
-   [DASMA Technical Data Sheets (full index)](https://www.dasma.com/technical-data-sheets/) — industry reference for door and operator systems

Serving the Valley

## Where we come out

We’re a family-run shop based in **Mesa**, and we cover the whole Phoenix metro. Same-day service is our standard — pick your city, or just call [(602) 935-9766](tel:+16029359766) and we’ll find the soonest slot that works.

[Phoenix Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/phoenix-arizona-garage-door-repair-and-service/) [Mesa Our home base](https://farnsworthgarage.com/service-areas-garage-door-repair/mesa-arizona-garage-door-repair-and-service/garage-door-opener-repair-mesa-az/) [Gilbert Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/gilbert-arizona-garage-door-repair-and-service/garage-door-opener-repair-in-gilbert-az/) [Chandler Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/chandler-arizona-garage-door-repair-and-service/) [Queen Creek Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/queen-creek-arizona-garage-door-repair-and-service/) [Scottsdale Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/scottsdale-arizona-garage-door-repair-and-service/) [Tempe Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/tempe-arizona-garage-door-repair-and-service/) [San Tan Valley Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/san-tan-valley-arizona-garage-door-repair-and-service/) [Apache Junction Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/apache-junction-arizona-garage-door-repair-and-service/) [Gold Canyon Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/gold-canyon-arizona-garage-door-repair-and-service/) [Fountain Hills Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/fountain-hills-arizona-garage-door-repair-and-service/) [Maricopa Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/maricopa-arizona-garage-door-repair-and-service/) [Guadalupe Garage door repair](https://farnsworthgarage.com/service-areas-garage-door-repair/guadalupe-arizona-garage-door-repair-and-service/)

Not sure if you’re in range? Give us a call — if we can’t get to you, we’ll point you to someone who can.

Mesa-based · Serving the whole Phoenix Valley

## Want us to just take care of it?

If you’ve worked through this and you’d rather have someone who does this every day handle it — that’s us. Tell us what your garage door opener is doing and we’ll come diagnose it properly.

[☎ (602) 935-9766 Call or text — we pick up](tel:+16029359766) [Book online Pick your own time slot](https://farnsworthgarage.com/book-appointment-now/)

-   **Same-day service** is our standard
-   **Family-owned** right here in Mesa
-   **Straight answers** — we’ll tell you if it’s not worth fixing
-   **Written quote** before any work starts

Due for a check-up anyway? Our full tune-up is **$39.99** — same price in every city we serve, and we’ll go through the whole system while we’re there.

Mesa · Gilbert · Chandler · Queen Creek · Scottsdale · Tempe · Phoenix · San Tan Valley · Apache Junction · Gold Canyon · Fountain Hills · Maricopa · Guadalupe

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Source: https://farnsworthgarage.com/garage-door-opener-troubleshooting/garage-door-opener-blink-codes/ · HTML version with images, galleries and booking form. Farnsworth Garage Door Service, Mesa, AZ · (602) 935-9766