PHOTO-EYE SENSOR SERVICE • GREATER BOSTON

Garage Door Safety Sensor Repair & Replacement

If your garage door will not close, reverses unexpectedly or shows a blinking sensor light, the photo-eye system may be blocked, misaligned, damaged or disconnected. We diagnose the cause before recommending repair or replacement.

Signs Your Garage Door Safety Sensors Need Service

Safety sensors communicate across the bottom of the garage door opening. When the beam or wiring is interrupted, the opener should prevent unsafe closing.

Door Will Not Close

The opener starts down, reverses or refuses to move the door toward the floor.

Blinking Indicator Light

A blinking or dark sensor light often points to alignment, obstruction, wiring or power trouble.

Door Closes Only While Holding the Wall Button

On many systems, this behavior indicates the safety circuit is not communicating correctly.

Sensor Was Knocked Out of Position

Storage, tools, bicycles and normal activity can move the sensor bracket.

Damaged or Cut Wires

Loose connections, staples, moisture or physical damage can interrupt the low-voltage circuit.

Intermittent Reversal

Sunlight, vibration, dirt or a marginal connection may produce inconsistent operation.

What We Inspect

Sensor lenses and obstructions
We clean and inspect both photo eyes.

Alignment and brackets
We verify both sensors face each other at the correct height.

Wiring and connections
We check visible wire damage, terminals and communication with the opener.

Opener response
We test closing behavior and safety reversal after service.

Repair, Realign or Replace?

We start with the simplest safe correction and replace parts only when the existing sensor or wiring cannot operate reliably.

Clean and Realign

Suitable when the sensors are functional but dirty, obstructed or slightly out of position.

Repair the Wiring

Appropriate when a loose connection or accessible damaged section interrupts communication.

Replace the Sensors

Recommended when a photo eye has failed, is physically damaged or cannot hold reliable alignment.

Proper Alignment Matters

Both sensors must be secure, powered and aimed across the same path. A glowing light alone does not always prove that the complete safety circuit is operating correctly.

After service we verify:
✓ Stable indicator lights
✓ Normal closing travel
✓ Beam-interruption reversal
✓ Wall control and remote response
✓ Clear mounting and wiring

Why Professional Diagnosis Helps

Avoid Replacing the Wrong Part

A closing problem can also come from travel settings, track resistance, opener logic or another mechanical issue.

Protect the Safety Function

The photo-eye system is designed to detect an obstruction. It should never be bypassed to keep the door operating.

Test the Complete Door

After sensor service, we confirm the opener and door respond correctly through full operating cycles.

Our Safety Sensor Service Process

1. Confirm the Symptom

We observe the lights, wall control response and closing behavior.

2. Inspect Both Sensors

We check lenses, brackets, height, alignment, wiring and terminals.

3. Correct the Cause

We clean, realign, repair wiring or install compatible replacement sensors.

4. Perform Safety Tests

We test beam interruption, reversal and complete opener travel.

Related Garage Door Services

Opener Repair & Installation

Sensor faults are part of the opener safety circuit. We also diagnose travel, force and control problems.

Remote & Keypad Service

Programming and troubleshooting for remotes, wireless keypads and access controls.

Garage Door Safety Assessment

Review important door, opener and safety components before a small issue grows.

Garage Door Safety Sensor FAQ

Why won’t my garage door close?

The sensors may be blocked, misaligned, dirty, damaged or unable to communicate. The opener can prevent closing for safety.

How do I know if the sensors are bad?

Blinking lights, immediate reversal or closing only while holding the wall button are common warning signs.

Can safety sensors be repaired?

Yes. Cleaning, alignment or wiring repair may solve the issue. A failed sensor usually requires replacement.

Do both sensors need replacement?

Compatible sensors are often supplied as a matched pair. We inspect both sides before recommending replacement.

How much does sensor repair cost?

Cost depends on whether the issue is cleaning, alignment, wiring, brackets, compatibility or failed hardware. We provide an estimate first.

Can I clean or align them myself?

You can gently clean the lenses and remove obvious obstructions. Stop if wiring is damaged or the problem continues.

Why is one sensor light blinking?

It commonly indicates obstruction, poor alignment, wiring trouble or loss of communication.

How long does replacement take?

Many sensor repairs are completed during one visit, depending on wiring condition and opener compatibility.

Need Your Safety Sensors Checked?

Schedule professional diagnosis before forcing or bypassing a garage door that will not close safely.