Start with the usual suspects
- Remote not working — replace the battery first; if the wall button works, it's the remote
- Door won't close and lights flash — almost always the safety sensors (photo eyes); realign them until both LEDs are steady
- No power — check the outlet, breaker, and that the opener is plugged in
- Works up close only — weak remote battery or a damaged antenna wire
Blinking lights are error codes
A LiftMaster's LED blinks in patterns to signal problems. A repeating sensor error (the door reverses or won't close) points to misaligned or dirty photo-eye sensors — clean the lenses and make sure nothing blocks the beam. Persistent codes after that usually mean a logic board or motor issue.
When to call
If the wall button also fails, the door is heavy or loud, or codes persist after you've checked sensors and power, it's time for a pro. We repair and replace every LiftMaster model — see our opener repair service, or weigh repair vs. replace. Same-day service across West Chester.
Frequently Asked Questions
Why does my LiftMaster light blink and the door won't close?
That's the safety-sensor signal — the photo eyes are misaligned, dirty, or blocked. Clean the lenses and align them until both LEDs glow steady, and clear anything in the door's path.
Why does my LiftMaster remote only work up close?
Usually a weak remote battery or a damaged antenna wire on the motor unit. Replace the battery first; if range is still short, the antenna or receiver may need attention.
Need a hand with your garage door? We offer same-day repair and spring replacement across Chester County. Call (610) 632-5206 for a free quote.