Garage Door Sensor Repair

What Garage Door Safety Sensors Do and When They Need Repair

Two small eyes sit near the floor on either side of your door. They send an invisible beam across the opening, and when something breaks it, the door stops closing or reverses. Federal rules require this protection on openers made or imported for sale in the US after January 1, 1991, and an electric eye is one accepted method.^[1]

Repair covers alignment, lens cleaning and wiring faults. Replacement is for a dead eye or a damaged unit.

In Phoenix, Mesa and Gilbert, dust and sun can foul lenses, and haboobs leave a film on everything. Wipe-downs and realignment fix many faults.

Sound familiar? Your door drops a few inches, then bounces back up. You bumped the bracket, wiped the lens, and it worked for a week. Now the opener lights flash and the door won't close at all.

Here are the signs that point to a sensor problem:

Leaving a faulty sensor alone pushes people to hold the wall button down or disconnect the safety system. That defeats the protection meant to stop the door on a child, a pet or a car bumper.

For the light-colour decoder, see Garage Door Sensor Blinking or Misaligned? How to Fix It.

What Affects Sensor Repair and Replacement Cost

Price depends on what is wrong. Alignment alone is a smaller job than new sensors. Wiring runs, opener brand and compatibility all move the total.

Price factors

What moves the price

• 01

  Type of fault

  Alignment alone costs less than new sensors

• 02

  Wiring

  A longer run or damaged cable adds labour

• 03

  Opener brand

  Replacement eyes must work with your opener

• 04

  Service-call fee

  Most list $0 to $150, and some credit it when you approve the repair

Figures below come from Phoenix-area garage door companies' own websites, checked October 2026. They are general guidance, not quotes.

Opener brand matters because replacement eyes must work with your opener. A longer wire run or a damaged cable adds labour.

For a replacement-focused breakdown, see Garage Door Sensor Replacement Cost.

Ask for an itemized written quote that separates the call-out fee, labour and parts.

Pro tip

Ask whether the service-call fee is credited when you approve the repair, since 2 of the 7 listings do this.

Contracts over $1,000 must carry the terms required by A.R.S. 32-1158.

How a Garage Door Sensor Repair Visit Works

Most visits take a single trip and follow four steps.

Step by step

The four steps of a visit

1. 1

   Diagnose

   Check lights, beam path, obstructions and opener response.

2. 2

   Clean and align

   Clean lenses, realign brackets and confirm the beam.

3. 3

   Wiring and replacement

   Repair wiring and replace a failed pair.

4. 4

   Test

   Confirm auto-reverse with an obstruction in the path.

1. Diagnose. The technician checks indicator lights, the beam path, obstructions and how the opener responds to the wall button.
2. Clean and align. Lenses get cleaned, brackets are realigned, and the beam is confirmed by closing the door and watching it reverse.
3. Wiring and replacement. Wiring to the opener is inspected and repaired, and a failed pair is replaced.
4. Test. The technician puts an obstruction in the door's path to confirm auto-reverse, then walks you through the result. The CPSC recommends a 2x4 on the floor for this test.^[1]

Alignment and cleaning

Most callouts in Tempe or Chandler start here. It is the quickest fix and often the whole job.

Wiring and replacement

Damaged wire or a dead eye takes longer. If the door still won't reverse properly after repair, the CPSC advises disconnecting the opener until it is adjusted, repaired or replaced.^[1]

A broken spring, off-track door or failed opener needs broader work. See Garage Door Opener Repair.

How to Verify an Arizona ROC Licence

Arizona generally requires a contractor's licence when the total project, labour and materials, is over $1,000 or the work needs a local permit.^[2]

Check before you book.

• Search the contractor's name or 6-digit licence number at roc.az.gov and confirm the licence is current.
• Confirm the licence class covers the work in your contract. Garage doors and openers have no class of their own, so read the class listed against your scope.
• Call the phone number on the licence record to confirm the person quoting you represents the licensee.^[2]
• Ask for proof of general liability insurance separately. Arizona does not require contractors to carry workers' compensation, so ask about that too.
• Exempt persons doing small jobs must advertise "not a licensed contractor."
• Get the quote in writing.

More detail is in Arizona ROC License for Garage Door Companies Explained and Questions to Ask Before Hiring a Phoenix Garage Door Company.

Checklist

Questions to ask before you book

0 of 6 ticked

• Is the licence current on roc.az.gov?
• Does the licence class cover the work in my contract?
• Does the phone number on the licence record reach the person quoting?
• Can you show proof of general liability insurance?
• Do you carry workers' compensation?
• Is the quote in writing?

Tick them off as you go. Nothing is saved or sent.

Compare the featured businesses serving Phoenix, Scottsdale, Glendale and the rest of the Valley below, and check each licence before you call.