Garage door problems
LiftMaster garage door opener not working
A LiftMaster garage door opener not working usually tells you why through its lights.
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Written by HyreGarage Research Desk Primary-source research and fact checking
The short answer
A LiftMaster garage door opener not working usually tells you why through its lights. On many current models the up and down arrows on the motor unit flash a two-number code, and LiftMaster’s support pages explain each one.
The most common is a sensor code: the safety reversing sensors are misaligned or blocked. Read the code, check power and the lock setting, then follow the chart for your model number.
Key takeaways
It is on the motor unit label. Codes differ by model.
Up arrow first, then down arrow, gives a code like 4-6.
Realign until both sensor LEDs are steady.
Check the wall control.
What should I check on a LiftMaster first?
Count the up-arrow flashes, then the down-arrow flashes. Match the pair to the chart for your model.
LiftMaster says to realign both sensors so both LEDs are steady and not flickering.
Many LiftMaster wall controls have a lock that blocks remotes.
Check the breaker and any GFCI in the garage.
If you use it, it can show the same error code on your phone.
Codes that point past the sensors
LiftMaster’s charts also list codes for wiring, motor and force faults. These need a technician or a support call.
Shorts, reversed polarity or broken sensor or wall-control wires.
The opener cannot sense the door moving.
The door is binding or out of balance. Fix the door, not the setting.
Some charts point to the logic board.
Common LiftMaster symptoms
| Symptom | What LiftMaster’s guides point to |
|---|---|
| Lights flash, door will not close | Sensors misaligned or obstructed. See LiftMaster error code 4-6. |
| Remotes fail, wall button works | Lock mode on, or remote battery. |
| Door reverses partway | Sensors, or the door binding. Check balance. |
| No response at all | Power, then the board. |
Call LiftMaster or a technician?
LiftMaster sells through professional dealers, so dealer support and the model manual come first for codes. Anything involving springs, cables or a door that will not move by hand is a technician job.
What to ask before you sign
Ask the technician to name it and the part it points to.
Check the model’s warranty document before paying for parts.
For older models, ask before repair.
The full ten-point checklist is on choosing a garage door company.
Where this goes wrong
Code layouts differ between models. Use the chart for your model number.
Most sensor codes are alignment or wiring, not failed sensors.
The code means the door is binding. Fix the door.
Get connected
Tell us about the work
Three short steps: the job, your home, and how to reach you. Nothing goes to a garage door company unless you agree.
Free, with no obligation: a person at HyreGarage reads it and replies. Matching is not live yet, so this is not a quote or a dispatch line. If a spring has snapped or the door is off its track, leave it closed and call a local garage door company now.
Find a Garage Door Professional
A person at HyreGarage reads the request and replies. Matching is not live yet, so this is not a dispatch line.
Questions
How do I read LiftMaster error codes?
Why is my LiftMaster blinking and not closing?
How do I reset a LiftMaster opener?
Is LiftMaster the same as Chamberlain?
Written and audited by
HyreGarage Research Desk
Primary-source research, data analysis and fact checking
We are not a garage door company. We read the agency file, the code record, the standards document or the public register ourselves, compute the figure from it, and publish it with the source and the date we retrieved it.
Where a number cannot be traced to a primary source, we publish the shorter page and say what we could not verify. Our own company records cover ten states; nothing national is ever derived from them.
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How this desk works
- Primary sources only. Injury counts come from CPSC. Housing counts come from the Census file, not from a summary of it. Code history comes from the building commission that adopted the code. We do not cite an article that cites a source; we retrieve the source and do the arithmetic ourselves.
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- Limitations go above the fold. If a figure is an upper bound, a bracket, or an association rather than a cause, that is said before the figure is quoted rather than in a footnote underneath it.
- No DIY instructions for spring, cable or track work. Those components hold enough stored energy to cause serious injury, and CPSC records the consequences. We describe what has failed and what a competent repair involves; we do not tell you how to do it.
Authorship on this site is organizational: the analysis belongs to the desk rather than to a named individual, and we do not publish credentials we do not hold. Our editorial policy sets out how we source, date and correct what we publish.
Sources & retrieval dates
Information on this page is general and varies with the door, the opener, local code and circumstance. It is not safety, insurance or legal advice.
Springs and cables hold dangerous stored energy: adjusting or replacing them is work for a trained technician. HyreGarage does not repair, replace or install garage doors.
This page explains the work so you can judge a quote and a company.