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Safety-sensor troubleshooting in Burnaby

Why Are My Garage Door Sensors Not Working?

If the door starts down and reverses, the photo-eye system may be blocked, dirty, misaligned or damaged. A few safe checks can narrow down the cause.

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Understand the system first

Sensors Protect The Closing Doorway

Garage door photo eyes are normally mounted a few inches above the floor on opposite sides of the opening. One sends a beam to the other. If the beam is interrupted or the opener cannot verify the sensor circuit, the door may refuse to close or reverse.

Indicator lights vary by manufacturer and model, so the opener manual is the best reference for a specific blinking pattern. Start by observing the behaviour rather than repeatedly pressing the controls.

Never bypass safety sensors. Do not tape a wall control down, splice wiring or change force settings to defeat a reversal problem.

Check the doorway first

Common Reasons Garage Door Sensors Fail

Blocked Beam

A vehicle tire, box, broom, snow shovel or other object may cross the sensor path.

Dirty Lens

Dust, water spots, cobwebs or garage debris can interfere with the photo eye.

Misaligned Bracket

A light bump can rotate one sensor so the pair no longer faces each other.

Loose Or Damaged Wire

Staple damage, a loose connection or corrosion can interrupt the low-voltage circuit.

Sunlight Interference

Direct low-angle sunlight can affect some sensor systems at certain times of day.

Failed Component

A sensor, logic board or related opener component may need model-specific testing.

Look closely, act safely

Read The Indicator Lights Carefully

Look at both sensors without moving them. A light that is off, dim or flashing can indicate misalignment, obstruction or a circuit fault, but meanings are model-specific. Note which side shows the change and consult the owner’s manual.

If a bracket is visibly bent, wiring is damaged or the lights will not stabilize after basic cleaning and obstruction removal, arrange professional diagnosis.

Dusty garage door photo-eye sensor on a slightly shifted bracket near the floor
Dust, stored items and a bumped bracket are common visible issues around photo eyes.
Homeowner gently cleaning a garage door safety sensor lens with a soft cloth
A soft dry cloth is enough for a basic lens check; wiring and bypass work should be left alone.

The practical next step

Safe Sensor Checks You Can Make

  1. Remove objects from the entire doorway and beam path.
  2. Wipe each lens gently with a clean, soft cloth.
  3. Check that both brackets are secure and face one another.
  4. Look for pinched or broken wire without touching exposed conductors.
  5. Test the door once while keeping the opening clear.
  6. Record any opener light or diagnostic code.

Use this checklist

Match The Symptom To The Likely Area

  1. Door will not start closing: check the beam, indicator lights and wall-control messages.
  2. Door starts down then reverses: remove obstructions and inspect sensors, then consider door resistance.
  3. Problem appears at one time of day: note direct sunlight on either lens.
  4. One indicator remains dark: check visible wiring and consult the model manual.
  5. Door reverses despite steady lights: track resistance, travel limits or force sensing may be involved.
  6. Stop testing if the door is crooked, noisy or mechanically jammed.

Connected components

When The Cause Is Elsewhere

Door Binds In The Track

Physical resistance can trigger reversal even when sensors appear normal.

Learn More →

Recurring Reliability Issues

A whole-door inspection checks fasteners, balance and moving hardware.

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Other Opener Symptoms

Use the broader opener guide when controls or power also fail.

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Homeowner questions

Garage Door Sensor Problems FAQs

Why is one garage door sensor light blinking?

Blinking can indicate obstruction, misalignment, wiring trouble or another model-specific fault. Check the manufacturer’s manual for the exact pattern.

Can sunlight affect garage door sensors?

Direct sunlight can interfere with some photo-eye systems. Note whether the problem occurs at the same time of day and have persistent faults diagnosed.

How do I clean garage door sensors?

Use a clean, soft cloth to wipe each lens gently. Avoid harsh cleaners, moving wiring or changing opener safety settings.

Why does my garage door reverse with clear sensors?

The door may be meeting physical resistance, or the opener may have a travel, force or internal fault. The complete door and opener should be checked.

Manufacturer guidance

Sources And Further Reading

Garage door service in Burnaby

Get The Cause Confirmed Before Parts Are Replaced

Describe what the door is doing, what changed and whether it is level. The repair path can then be based on the complete system.

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