Repair the opener when one worn part has failed, such as the drive gear and sprocket, a safety sensor or a remote, and the unit already has rolling-code remotes and photo-eye sensors. Replace it when the logic board fails on an older unit, when it uses fixed-code remotes, or when it predates safety sensors. Any new opener installed in California must have battery backup.
Key takeaways
- A stripped drive gear, a bad sensor or a dead remote is a repair. A failed logic board on an older opener often points to replacement.
- Openers made before 1993 may have no entrapment protection. One without safety sensors should be replaced.
- Remotes with a row of small DIP switches use a fixed code. Rolling-code remotes change the code every press.
- Since July 1, 2019, every residential opener sold or installed in California must have battery backup (SB 969).
- Belt drive is quieter, chain drive is durable, and wall-mount frees the ceiling but needs torsion springs.
- Check the springs first. No opener can lift a door with a broken spring.
An opener that stops working is not always an opener that needs replacing. Some failures are one worn part on an otherwise good unit. Others are a sign the opener is a generation behind on safety, security and California law. Here is how to tell the difference.
Check the door before you judge the opener
The springs lift the door. The opener only guides it. A door with a broken spring or worn springs makes any opener strain, hum or quit, and a new opener will not change that.
Safety first. Never unwind, adjust or remove a spring, a lift cable, a cable drum or a bottom bracket, and never run the opener with a broken spring or a snapped cable. Check the springs by eye, from the floor. If they look intact, our will not open or close checklist walks through the safe checks, including the balance test. If one is broken, read what to do when a spring breaks first.
How old is the opener, and what does it have?
Age matters less than what the opener can do. Three questions settle most cases.
- Does it have safety sensors? Openers manufactured for sale in the United States since January 1, 1993 must meet a federal entrapment-protection standard, which in practice means photo-eye sensors near the floor. An opener without them should be replaced, not repaired.
- Do the remotes use rolling code? If the remote has a row of small DIP switches inside, it sends the same fixed code every time.
- Does it have battery backup? Not required for an opener already installed and working, but required for anything new.
If your opener has sensors and rolling code, it is usually worth repairing a single failed part.
Is a stripped drive gear worth repairing?
On LiftMaster, Chamberlain and Craftsman chain and belt openers, the drive gear and sprocket are among the most common failures. The motor hums or runs, but the trolley does not move along the rail.
This is usually a good repair on an opener that otherwise works, because the gear is a standard part and the rest of the unit is unaffected. A stripped gear can also be a symptom of a door that has been heavy for months, so we check the springs at the same time. The symptoms are on our opener runs but door does not move page, and the brand detail on our LiftMaster page.
What about a failed logic board?
The logic board is the opener’s control circuit. When it fails, the opener may not respond at all, respond only to the wall button, or behave erratically, often after a power surge.
On a newer opener, a board is a reasonable repair. On an older one, price the board against a new opener with battery backup, rolling code and a warranty before you decide. Older boards also get harder to find over time.
Rolling code and security
A fixed-code remote sends the same signal every press, which is why DIP switch remotes are a security weak spot. Rolling-code remotes change the code with every press. LiftMaster and Chamberlain call theirs Security+: Security+ 2.0 on openers built through 2024, and Security+ 3.0, with a white learn button and its own remotes, from 2025. Genie uses Intellicode.
If the opener works but the remotes are fixed code, replacing the opener is the clean fix, and our page on legacy and discontinued openers covers what can still be kept running in the meantime. If the opener is rolling code and a remote has died, that is a remotes and keypads job, not a new opener.
California battery backup law
Senate Bill 969 was signed in September 2018 and added section 19892 to the Health and Safety Code. Since July 1, 2019, any residential automatic garage door opener manufactured for sale, sold, offered for sale or installed in California must have a battery backup that keeps it working in a power outage. Violations carry a civil penalty of $1,000 per opener.
It followed the 2017 California wildfires, when some residents could not open their garages during outages. In practice it means three things:
- Any new opener we install has battery backup.
- A replacement garage door may not be connected to an existing opener without battery backup.
- Nothing in the law requires you to swap out a working opener that predates it.
Chamberlain Group says its backup batteries last approximately one to two years with normal use. The battery backup law guide covers the details.
Belt, chain, screw or wall-mount
- Belt drive is quiet, the right choice when a bedroom sits over or beside the garage.
- Chain drive is durable and usually the least expensive, and noise matters less in a detached garage.
- Screw drive, found on some Genie models, turns a long threaded rod to move the trolley.
- Wall-mount (jackshaft) mounts beside the door on the torsion tube, frees the ceiling for storage and runs quietly. It needs a door with torsion springs.
The belt, chain, screw and wall-mount comparison weighs noise, upkeep and ceiling space for each. In San Diego, a new belt-drive opener installed typically runs $450 to $800. That is a market range, not our price. Ours are on our pricing page.
Smart features
LiftMaster and Chamberlain openers use the myQ app, and Genie uses Aladdin Connect. Built-in Wi-Fi lets you check and close the door from your phone. Many cars can learn the opener through HomeLink. Smart features are a good reason to choose one new opener over another, but rarely a good reason on their own to replace an opener that works.
Repair or replace: a decision table
| Situation | Usually | Why |
|---|---|---|
| Motor hums or runs, trolley does not move | Repair | Drive gear and sprocket is a standard part |
| Sensor light blinking, door will not close | Repair | Sensors and wiring are replaced on their own |
| Remote dead, wall button works | Repair | Battery, programming or a new remote |
| Logic board failed on an older opener | Often replace | Price the board against a new opener first |
| Remotes use DIP switches (fixed code) | Replace | No rolling-code security |
| No safety sensors at all | Replace | Predates the entrapment-protection standard |
| Replacing the door, opener has no battery backup | Replace | Required by California law |
| Springs broken or door very heavy | Fix the door first | The opener is not the problem |
Across San Diego
In inland communities like Poway, Lakeside and Scripps Ranch, where Santa Ana winds and fire season are part of the year, a working backup battery matters more than any app. Test it once in a while by unplugging the opener and running the door.
Next step
If the opener has failed and the springs look fine, book opener repair. If it is time for a new one, our opener replacement and installation page covers the options, and a photo of the label on the old unit tells us what you have.
Rather have a technician look at it?
We repair garage doors across San Diego County, same day in most cases, with the price agreed before we come out.
Frequently asked questions
Is it worth repairing an old garage door opener?
It depends on what failed and what the opener has. A stripped drive gear, a bad sensor or a worn trolley on an opener with rolling-code remotes and safety sensors is usually worth repairing. A failed logic board on an older unit, fixed-code remotes, or no safety sensors at all point to replacement. Price the repair against a new opener with battery backup before deciding.
How long do garage door openers last?
There is no set number of years. An opener is done when repairs stop making sense: when it has no safety sensors, uses fixed-code remotes set with DIP switches, or needs a logic board that is hard to find or costs close to a new unit. A stripped drive gear or a dead sensor on an otherwise sound opener is a routine repair, so age alone does not retire one.
If I replace my garage door, do I have to replace the opener too?
In California, if the existing opener has no battery backup, yes. Since July 1, 2019, a replacement residential garage door may not be connected to an existing opener that lacks the battery backup function. If your opener already has battery backup and is in good shape, it can usually stay. A new garage door is a job for a licensed contractor.
What are the signs a garage door opener is failing?
The motor hums or runs but the trolley does not move along the rail, which usually means a stripped drive gear. The opener responds only to the wall button, ignores every control or acts erratically, often after a power surge, which points to the logic board. Grinding from the motor head counts too. Check the springs before blaming the opener, since a heavy door makes any opener strain or quit.
Should I replace a garage door opener that has no safety sensors?
Yes. Openers manufactured for sale in the United States since January 1, 1993 must meet a federal entrapment-protection standard, which in practice means photo-eye sensors near the floor that stop and reverse a closing door. An opener without them is missing that protection, so repairing it rarely makes sense. Any replacement installed in California must also have battery backup.
Sources
- Health and Safety Code section 19892, California Legislative Information
- SB-969 Automatic garage door openers: backup batteries (2017-2018), California Legislative Information
- California SB 969 FAQs, Chamberlain Group
- 16 CFR 1211.1, Effective date (Safety Standard for Automatic Residential Garage Door Operators), Legal Information Institute, Cornell Law School