Garage door sensor repair and alignment
Garage door safety sensor repair costs $125 to $300, but a door that reverses on closing is most often solved for free by wiping the lenses and realigning the brackets — a five-minute fix that needs no tools.
- Typical cost
- $125–300
- Time on site
- 30–45 min
The two sensors have to see each other across the opening. Knock one out of alignment — a bike, a bin, a passing car — and the opener reads the broken beam as an obstruction and reverses.
The five-minute fix, in order
Wipe both lenses with a dry cloth. Dust, cobwebs and road film block the beam and this alone fixes a large share of cases.
Check the indicator lights on both brackets, about six inches off the floor. One sensor should show a steady light and the other a steady light of a different colour. A blinking or dark light means the beam is broken or misaligned.
Gently nudge the sensor with the unsteady light until it goes solid, then tighten the wing nut. Sensors are usually knocked by bikes, bins or a passing car.
Clear anything in the beam path, including a coiled hose or a stack of boxes near the door edge.
When it is not the alignment
If both lights are dark, check that the opener has power and that the sensor wires are not pinched or chewed at the staples along the track.
Direct sunlight hitting a lens at certain times of day can overwhelm the receiver, which produces a fault that appears only in the afternoon. A short shade or repositioning solves it.
A sensor that has been wet — from a flooded floor or a hose — often fails permanently. Replacement is $125 to $300 including the visit.
Should you do this yourself?
Try it yourself first. Sensor alignment is genuinely a homeowner fix and it resolves the majority of these calls. Only bring someone in if the lights stay dark after cleaning and realigning, which points to wiring or a failed sensor.
Symptoms that lead here
Common questions
Why does my garage door close partway then go back up?
The photo-eye safety sensors near the floor are misaligned, dirty, or blocked. The opener reads the broken beam as an obstruction and reverses, which means the safety system is working. Wiping the lenses and realigning the brackets fixes most cases for free.
Can I bypass the garage door sensors?
No, and you should not. The photo-eye reversal has been federally required on residential openers since 1993 because doors killed children before it existed. Bypassing it also usually violates your homeowner's insurance.
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