Opener repair
Garage Door Opener Not Working: Sensor, Remote, or Motor?
Diagnose common garage door opener problems before paying for a full replacement — photo eyes, remotes, wall buttons, rails, motors, and force settings explained for Portland and Vancouver homeowners.
Fast answer
- If the door reverses just before closing, start with the safety sensors — misalignment or debris is the most common cause.
- Replace the remote batteries and test the wall button independently to isolate a remote issue from an opener issue.
- A motor that hums but the door doesn't move often points to a stripped gear or a door that is too heavy for the opener (check for a broken spring first).
- Chain-drive openers older than 10–15 years may cost nearly as much to repair as a new unit installed — ask the technician to compare both options.
Symptom: the door reverses near the floor
Safety sensors sit roughly 4–6 inches off the ground on each side of the door opening. One unit sends an infrared beam; the other receives it. If anything breaks the beam — a piece of debris, a cobweb, or one sensor knocked out of alignment — the opener reverses the door as a safety measure. Look at both sensor bodies: each should have a small indicator LED. If one is flashing or dark, the beam is broken. Wipe the lens with a clean cloth and gently rotate the sensor in its mounting bracket until both LEDs go solid. The door should close normally after that.
Symptom: the remote doesn't work
Before assuming the opener is broken, try the wall-mounted button inside the garage. If the wall button works and the remote does not, the remote is the problem — not the opener. Replace the remote batteries first (CR2032 or AA, depending on the brand). If new batteries don't fix it, the remote may need to be reprogrammed to the opener; the procedure is usually printed inside the motor unit cover. If neither the remote nor the wall button triggers any response from the opener, the opener itself is the problem.
Symptom: opener runs but door doesn't move
If you can hear the opener motor running and the trolley (the carriage on the rail above the door) is moving, but the door stays closed, the trolley may have disconnected from the door bracket. This sometimes happens after someone pulls the emergency release cord. Re-engage the trolley by closing the door manually and pushing the opener button — the trolley should lock back onto the door arm with a click.
If the motor hums but neither the trolley nor the door moves, you may have a stripped drive gear inside the motor housing. This is a common failure on older chain-drive units and is repairable — a technician can usually swap the gear set in about an hour.
Symptom: opener works but door seems too heavy
If the opener struggles to lift the door — moving slowly, stopping partway, or triggering the auto-reverse — the issue may not be the opener at all. Disconnect the opener (pull the emergency release with the door closed) and try lifting the door manually from the center. A properly balanced door should lift smoothly with light effort and stay in place when you let go at mid-height. If it feels very heavy or drops, a spring is likely broken or losing tension. Continuing to run the opener against a heavy door strains the motor and eventually burns it out.
When repair doesn't make sense
Older chain-drive openers — particularly units without safety sensors or rolling-code technology — can cost $100–$200 to repair while a new belt-drive unit with Wi-Fi and a battery backup runs $250–$450 installed. If your opener is past 12–15 years old and showing multiple problems, replacement is often the more economical and safer long-term choice. A technician can quote both options in the same visit.
Same-Day Service Available Most opener repairs diagnosed and fixed in one visit
Common questions
Why does my garage door opener run but the door doesn't move?
This usually means the trolley has disconnected from the opener carriage — often via the emergency release cord — or the door is too heavy for the motor, frequently a sign of a broken spring.
My remote stopped working but the wall button still opens the door — what's wrong?
That isolates the problem to the remote itself: try fresh batteries first, then check whether the opener's antenna is bent or obstructed before assuming the motor or logic board has failed.
Should I repair or replace an old garage door opener?
If your opener is a chain-drive unit older than 10–15 years, repair costs can approach the price of a new installed unit — ask your technician to compare both options before committing to a repair.