Field notes · 2026-08-04

Garage door opener not working: what each symptom means

Openers fail in a handful of specific ways, and the symptom almost always names the part. Find yours below. Some of these are five-minute fixes, and knowing which one you have makes the repair call faster and cheaper either way.

Remote does nothing, wall button works

That’s the remote side, not the opener. Swap the coin battery first. They die faster in cold garages, a valley special. If a fresh battery does nothing, re-pair the remote: press the “learn” button on the motor unit, then a button on the remote within 30 seconds. Still dead after that, and the receiver board is the suspect.

Nothing works, no lights, no hum

Power. Check the outlet the opener hangs from with a phone charger, then the GFCI chain and the breaker. Garage circuits share with outdoor receptacles more often than you’d think, and one wet receptacle trips the lot.

The motor hums but the door doesn’t move

That’s the classic stripped drive gear. The white nylon gear inside the housing gives up after years of moving a door that got heavier every winter, and it’s a repairable part on most units under ten years old. But check the door first, before blaming the motor. Pull the red release cord and lift the door by hand. If it’s heavy like a piano, the springs are gone and the motor was humming in self-defense. That’s a spring problem, not an opener problem.

The door starts down, then reverses

Photo-eye sensors, nine times out of ten. Wipe both lenses (frost counts as dirt), check both indicator lights are solid, and make sure a bracket didn’t get kicked. If the lights are solid and it still reverses, the close-force limit may need adjustment. That’s a tune item rather than a new part.

It opens but won’t close at all

Same sensor story, but worth saying separately because it strands doors OPEN, which in January is urgent. Most openers will close in “constant pressure” mode: hold the wall button down firmly until the door is fully shut. That’s your workaround to secure the house until the sensor issue is fixed.

It’s loud, jerky, or shakes the ceiling

Usually a worn trolley, a stretched chain, or dry rails. These are maintenance items, cheap to fix and hard on everything when ignored. If the racket is new and the door also struggles by hand, check the springs before blaming the opener.

When replacement beats repair

A single failed part in a unit under ten years old is worth repairing. At fifteen or more years old, pre-dating rolling-code remotes and modern safety reversal, put the repair money toward a new unit instead. The math and the safety both point the same way. Both numbers, side by side, is how our opener estimates come back.