Garage Door Sensor Repair & Alignment — Toronto & GTA
Royal Garage Doors | Photo-Eye Safety Sensors | FREE Service Call | 1-Year Warranty
Garage door sensor repair in Toronto & the GTA
If your garage door won't close, the opener light blinks, or a sensor shows a red or flickering light, the photo-eye safety sensors need attention. Royal Garage Doors repairs, realigns and replaces garage door safety sensors across Toronto, Etobicoke, North York and the GTA for $120–$180 + tax. Our IDEA Certified technicians — led by Michael Thompson — clean and realign misaligned eyes, repair damaged low-voltage wiring, replace cracked or dead sensors, and re-test the auto-reverse so your door closes safely and fully. The service call is FREE with any repair; a $120 diagnostic applies only if you choose not to proceed. Most sensor jobs are finished in one visit, with a 1-year warranty and no weekend or holiday surcharge. Call 437-265-9995 for same-day service.
What Garage Door Safety Sensors Do
Every garage door opener made since 1993 has a pair of photo-eye safety sensors mounted about six inches above the floor on each side of the door. One sensor sends an invisible infrared beam across the opening and the other receives it. While the door is closing, if anything breaks that beam — a child, a pet, a car bumper, a trash can — the opener immediately stops and reverses the door. This auto-reverse is the single most important safety feature on a residential garage door, and it is required by code, so the sensors must be working for the door to close at all. When the receiving eye can't see the beam, the opener assumes something is in the way and refuses to close: the door starts down and rolls back up, or won't move while the opener light flashes (often ten blinks). The cause is almost always a sensor that has been knocked out of alignment, a lens caked with dust, cobwebs or road salt, direct sunlight washing out the receiver, a loose or corroded wire, or a sensor that has simply failed. See our guides on aligning garage door sensors and what the green and red sensor lights mean.
Our technicians diagnose the exact fault on-site. We clean both lenses, loosen the brackets and realign the eyes until the receiver shows a steady light, then re-tighten everything so they stay put. We test the low-voltage wiring for breaks, shorts and corroded staples, repair or re-run wire as needed, and replace any sensor that is cracked, water-damaged, sun-faded or electrically dead with a compatible unit. Finally we run the door through several full cycles and place a test object in the beam to confirm the auto-reverse stops and reverses the door correctly. Because sensor faults are so common, we carry photo-eyes, brackets and wire for all major brands — LiftMaster, Chamberlain, Genie, Craftsman and more — on every truck, so the great majority of sensor repairs across the GTA are completed on the first visit. If a sensor problem is actually a wider opener fault, see our opener repair page.
Common Sensor Problems We Fix
All brands serviced — 437-265-9995
Door Won't Close / Light Blinks
The door starts down then reverses, or won't move while the opener light flashes. This is the classic misaligned-sensor symptom. We realign and test until it closes fully — $120–$180.
Red or Flickering Sensor Light
A receiving eye that shows red or won't hold steady means the beam is broken by misalignment, dirt or sun. We clean, realign and re-aim the eyes. See green vs red lights.
Knocked or Loose Bracket
A bumped sensor or bent bracket throws the beam off. We remount, secure and realign the brackets so they stay aligned through daily use.
Wiring Fault or Corrosion
Broken, shorted or corroded low-voltage wire stops the signal reaching the opener. We test the run, repair or replace the wiring, and restore reliable operation.
Sun Glare Interference
Low morning or evening sun on a west- or east-facing garage can wash out the receiver. We reposition the eye, add a shade, or replace with a sun-tolerant sensor.
Cracked or Dead Sensor
Water damage, impact or age can kill a photo-eye entirely. We replace it with a compatible unit and re-test the full auto-reverse safety function.
Green & Red Sensor Lights Explained
Both photo-eyes have a small indicator LED, and reading them is the fastest way to understand a sensor problem. The sending eye usually shows a steady light whenever it has power — that light alone does not mean the sensors are aligned. The receiving eye is the one that matters: it lights steadily only when it is seeing the beam from the sender. On most brands a steady (often green or amber) receiver light means the pair is aligned and the door will close; a light that is off, red, or flickering means the beam is broken. If the receiver won't hold steady no matter where you aim it, the sensor or its wiring has likely failed and needs repair or replacement. Never tape the sensors up, twist them to face each other off-axis, or bypass them to force the door closed — that defeats the safety system that protects children and pets. For required performance of these devices, the door & access systems industry references standards published by DASMA, and opener makers such as LiftMaster publish brand-specific alignment guidance. Our technician will diagnose and fix the real cause so your door closes safely. Read our step-by-step alignment guide.
Sensor Repair Pricing
Transparent pricing — FREE service call with any repair.
| Service | Price (CAD + tax) | Notes |
|---|---|---|
| Service Call / Diagnostic | FREE | $120 only if you don't proceed with the repair |
| Sensor Realignment & Test | $120–$180 | Clean, realign, wiring check, auto-reverse test |
| Sensor Replacement | $120–$180 | Compatible photo-eye, all major brands |
| Wiring Repair / Re-run | Quoted on-site | For broken or corroded low-voltage wire |
1-year warranty on parts and labour. No weekend or holiday surcharge. See full pricing or book online.
Sensor Repair Across the GTA
Royal Garage Doors provides same-day garage door sensor repair from our Etobicoke branch, serving Toronto, Etobicoke, North York and the wider Greater Toronto Area. Our trucks carry photo-eyes, brackets and low-voltage wire for all major opener brands, so the technician can realign, repair or replace your sensors and restore safe, code-compliant operation on the first visit. Need related help? See our garage door repair near me page, opener repair, or browse all services. We also publish maintenance tips on the blog. We serve:
Frequently Asked Questions — Sensor Repair
Answers from Michael Thompson, IDEA Certified — 15+ Years Experience
How much does garage door sensor repair cost in the GTA?
+Safety-sensor (photo-eye) repair, realignment or replacement runs $120–$180 + tax. That covers cleaning and realigning the sensors, checking and repairing the wiring, and replacing a failed sensor or bracket where needed. The service call is FREE when you proceed with a repair; a $120 diagnostic applies only if you choose not to proceed. Most sensor jobs are completed on the first visit. Call 437-265-9995.
Why won't my garage door close and the opener light blinks?
+A door that won't close while the opener light blinks (often 10 times) is the classic safety-sensor fault. The two photo-eyes near the floor on each side of the door must see each other; if they are misaligned, dirty, sun-blinded, blocked, or have a wiring fault, the opener thinks something is in the way and refuses to close. The fix is cleaning and realigning the sensors, repairing wiring, or replacing a failed eye — $120–$180 in a single visit.
What do the green and red lights on garage door sensors mean?
+One sensor (the sending eye) shows a steady light to confirm power; the other (the receiving eye) shows a steady light only when it sees the beam. On most brands a steady green means aligned and a flickering or off red light (or blinking light) means the beam is broken — by misalignment, dirt, sunlight, an obstruction, or a wiring fault. If the receiving light won't stay solid, the sensors need realigning or repair. See our blog on sensor green and red lights.
Can you replace garage door safety sensors?
+Yes. If a sensor is cracked, water-damaged, sun-faded, or electrically dead, we replace the photo-eye with a compatible unit, re-run or repair the low-voltage wiring, remount and realign the brackets, and test the auto-reverse so the door stops and reverses on a genuine obstruction. Sensor replacement is part of the $120–$180 service and is completed same-day on most brands including LiftMaster, Chamberlain and Genie.
Are garage door sensors required by law?
+Yes. Since 1993, U.S. and Canadian safety standards require every residential garage door opener to have a working photo-eye reversing system, so the door reverses if anything breaks the beam while closing. Bypassing or disabling the sensors is unsafe and against code — especially with children or pets in the home. If your sensors are failing, repair them rather than defeating them. We restore full, code-compliant operation.
Do you offer same-day sensor repair across the GTA?
+Yes. We carry common photo-eye sensors, brackets and low-voltage wire on every truck, so most sensor repairs across Toronto, Etobicoke, North York and the GTA are done same-day, including weekends and holidays at no extra charge. Typical response time is 30–60 minutes. Call 437-265-9995.
Book Sensor Repair — 437-265-9995
Same-day sensor service across Toronto & GTA. $120–$180. FREE service call. 1-year warranty.
2963 Windjammer Rd, Mississauga, ON L5L 1S8 (HQ)
Etobicoke (2nd office): 12 Featherwood Pl, ON M9A 4V6 · 5.0 from 485 reviews