How to Fix a Garage Door That Won't Close: Sensor, Limit, and Track Issues (2026)
A garage door that reverses before closing, stops partway, or won't close at all is usually a safety sensor alignment problem. This guide covers aligning photo-eye sensors, adjusting close limit switches, and checking for physical obstructions.
Garage door reverses immediately when closing or won't close and the opener light blinks: the photo-eye sensors are misaligned or obstructed. Look at the two small sensors near the floor on each side of the door opening — they should both show solid lights (usually one green, one amber). If one is blinking or off: it's misaligned. Loosen the sensor bracket, aim it until the indicator light goes solid, then tighten. Wipe the sensor lenses with a dry cloth.
Frequently Asked Questions
How do the photo-eye safety sensors work?
Two sensors sit about 6 inches off the floor, one on each side of the garage door opening. One sensor (the sending unit) emits an invisible infrared beam; the other (the receiving unit) detects it. If the beam is broken when the door is commanded to close — by an obstruction, a misaligned sensor, or a damaged sensor — the opener reverses or refuses to close. This is a required safety feature (mandated for garage door openers sold after 1993). The sending unit typically has a steady amber light; the receiving unit has a steady green light. A blinking or absent light means misalignment or a fault.
The sensors look aligned and both lights are solid, but the door still reverses. What now?
If sensor lights are both solid and the door still reverses: (1) Physical obstruction — something small may be in the door path that the sensors can't detect (the beam is at the bottom, not throughout the door travel). Check for debris on the floor in the door path. (2) Close force adjustment — the opener's force setting is too sensitive. The force adjustment knob (usually on the opener motor unit — labeled 'close force') controls how much resistance triggers a reversal. Turn it slightly clockwise (increases force). Don't over-adjust — the door must reverse when it contacts an obstacle. (3) Track obstruction — debris or a bent track section causes the door to bind and trigger force reversal.
The garage door closes but only goes down 2–3 feet before reversing. What is wrong?
Partial close with reversal is almost always a close limit switch setting. The close limit tells the opener how far down the door should travel before stopping. If the limit is set too high (thinks the door is fully closed before it is), the opener cuts power and the spring tension reverses the door. The close limit adjustment is on the opener motor unit — look for a knob or screw labeled 'close limit' or 'down limit.' Turn it in the decrease direction (usually counterclockwise) to allow the door to travel further down.
My garage door closes with the wall button but won't respond to the remote. Is this related?
If the wall button works but the remote doesn't: the remote battery is dead or the remote is out of range (move closer and test). If battery and range are fine: the remote needs reprogramming (button on the opener motor unit, usually labeled 'learn'). If neither wall button nor remote closes the door: it's a sensor, limit switch, or wiring issue — follow the sensor troubleshooting above.
How do I close the garage door manually?
Disconnect the door from the opener by pulling the red emergency release cord (the red handle hanging from the trolley on the rail). This disengages the door from the drive mechanism. The door can then be lowered by hand. Hold the door as it closes — a properly balanced door should stay in place when you let go. If it crashes down or flies up: the spring tension is wrong and should be assessed by a professional (garage door spring adjustment is a safety hazard).
Garage door reverses immediately when closing or won’t close and the opener light blinks: the photo-eye sensors are misaligned or obstructed. Look at the two small sensors near the floor on each side of the door opening — they should both show solid lights (usually one green, one amber).
Most garage door closing failures are sensor alignment issues that take 5 minutes to fix.
What you need
- Dry cloth (to clean sensor lenses)
- Screwdriver set (to adjust sensor bracket)
- Step ladder (to access limit adjustment on opener)
Step 1: Check the safety sensors
Look at both sensors near the floor. The sending unit (usually amber light) and receiving unit (usually green light) should both show solid lights.
Blinking or no light: loosen the mounting bracket on the problem sensor (usually a wing nut), pivot the sensor until the indicator light goes solid, retighten.
Clean both sensor lenses with a dry cloth. Even a thin layer of dust or cobwebs can interrupt the beam.
Check that the sensor mounting brackets haven’t been bumped by cars or bikes — realign if bent.
Step 2: Remove all obstructions
Walk the full path of the door and look for anything that could interrupt the sensor beam: a hose, tool, small object on the floor, a spider web directly across the beam path.
Step 3: Adjust close limit (if door stops too soon)
Access the motor unit on the ceiling (use a ladder). Look for the limit adjustment knobs or screws. Find the close/down limit control. Turn it slightly in the “decrease” direction to allow the door to travel further. Run the door and check.
Step 4: Adjust close force (if door reverses from binding)
On the motor unit, find the close force control. Turn slightly clockwise to increase close force. Test carefully — the door must still reverse when meeting resistance (place a 2x4 flat on the floor in the door path, run the door — it should reverse when it hits the board).
Related guides
- How to Fix a Garage Door — full garage door troubleshooting
- How to Install a Garage Door Opener — opener replacement if sensors are a broader failure
- How to Fix a Garage Door Spring — spring assessment for door that won’t stay in position
- Check and align the safety sensors
Look at both sensors mounted about 6 inches above the floor on each side of the door opening. The sending unit (amber light) should be solid. The receiving unit (green light) should be solid when aligned — a blinking green light means misalignment. Loosen the mounting wing nut or bracket screw, pivot the sensor until the green light goes solid, retighten. Clean both sensor lenses with a dry cloth — dust or cobwebs can block the beam.
- Remove all obstructions from the beam path
Walk the full width of the door opening and look for anything that could interrupt the sensor beam at floor level: a hose, tool, leaf, spider web, or garbage can. Even a small object or a cobweb directly in the beam path prevents closing. Also check that sensor mounting brackets haven't been bumped by a car or bike — realign if bent.
- Adjust the close limit if the door stops too soon
If the door partially closes then stops (not reverses): the close limit switch is set too low and the opener thinks the door has reached the ground before it has. Access the motor unit on the ceiling (use a ladder). Find the close limit adjustment knob or screw (labeled 'Close', 'Down', or 'Close Limit'). Turn slightly in the decrease direction to allow the door to travel further down. Test after each small adjustment.
- Adjust close force if the door reverses from binding
If the door reverses due to resistance from cold weatherstripping, a stiff track, or slight binding: find the close force control on the motor unit. Turn slightly clockwise to increase closing force. Test carefully after each adjustment — the door must still reverse when it contacts an obstacle (place a 2x4 flat on the floor, run the door: it should reverse when it hits the board). Never over-tighten force beyond the auto-reverse safety requirement.
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