What garage door sensors do
A pair of photo-eyes near the floor projects an invisible beam across the opening. If the beam is blocked or the opener cannot confirm alignment, the system prevents normal closing to reduce entrapment risk.
Common sensor problems
Dust, spider webs, direct sunlight, bumped brackets, loose fasteners, corroded connections, staple-damaged wires, moisture, and failed sensor modules can interrupt the signal. The opener model and light pattern help identify the fault.
Alignment is more than pointing the lenses
Both sensors need stable brackets, correct height, clean lenses, sound wiring, and an unobstructed path. A bracket that vibrates as the door moves can create intermittent failures even when the lights look normal at rest.
Do not bypass the safety system
Holding the wall button may temporarily close some doors, but it does not fix the fault. Sensors should not be taped together, removed, or permanently bypassed. The safety reversal system should be tested after repair.
Frequently asked questions
Sensor Repair FAQ
Why is one garage door sensor blinking?
It usually indicates misalignment, obstruction, wiring trouble, or a failed sensor, depending on the opener brand.
Why does the door close only when I hold the button?
Many openers use constant-pressure closing when the sensor circuit is not satisfied.
Can sunlight interfere with garage door sensors?
Yes. Strong direct light can affect some sensors, though alignment, wiring, and mounting should also be checked.
Request service
Describe the problem and send a photo.
Use the quote form to share the ZIP code, symptoms, and an optional photo of the damaged area.
