At Wm. Haws Overhead Garage Doors in Guelph, we see garage door sensors fail in snow and ice because drifts, frost, and condensation block the beam between the two photo-eyes, or cold shifts their alignment. When the beam breaks, the opener stops or reverses the door as a safety response. If cleaning and realigning the sensors does not fix the issue, our team provides overhead garage door repair in Ontario to diagnose wiring, sensor, and opener faults. 
Key Points to Note:
- Blocked beam: Snow piled at the door base is a frequent cause.
- Frost and fog: A thin film on a lens can break the signal.
- Alignment: Ice on brackets can knock sensors out of line.
- Never bypass: Sensors stop the door from closing on people, pets, and cars.
What Are Garage Door Sensors and How Do They Work?
Garage door sensors, also called photo-eyes, are two small units mounted near the floor on each side of the door opening. One sends an invisible infrared beam, and the other receives it. If anything crosses the beam while the door closes, the opener reverses.
Because the sensors sit close to the floor, they share space with snow, slush, and ice.
Why Does Winter Weather Interfere With Sensors in Ontario?
Snow and moisture collect exactly where sensors are mounted. Guelph experiences substantial winter precipitation, averaging 160.6 cm (63 inches) of snowfall per year, according to Environment and Climate Change Canada’s 1971 to 2000 climate normals. Lake-effect squalls along Lake Huron add heavy drifts in Kincardine, Point Clark, and Goderich.
| Cause | What Happens | Quick Fix |
| Snow or slush buildup | Blocks the beam | Clear snow around both sensors |
| Frost or condensation | Weakens the signal | Wipe lenses with a soft, dry cloth |
| Ice on brackets | Pushes sensors out of line | Remove ice and realign until lights are steady |
| Cold, brittle wiring | Causes intermittent signals | Book a professional wiring repair |
| Sun glare off snow | Confuses the receiver | Adjust the angle or add a sensor shade |
How Can You Tell If a Sensor Problem Is Weather-Related?
If the door reverses before closing and the sensor lights blink or go dark after a storm, weather is a likely cause.
Common examples include a door that bounces back after a Fergus snowfall, a lens that fogs when a warm car parks in a Rockwood garage, or a bracket shifted by ice in Elora.
When Do Sensor Problems Need Professional Garage Door Repair?
Call for garage door repair if cleaning and realigning do not restore normal operation. Damaged wiring, failed sensors, and opener faults need proper testing tools.
Our Ontario technicians provide overhead garage door repair and inspect sensors, wiring, and opener force settings together. If your door will not close at night and leaves your home open, request emergency garage door repair in Ontario.
Frequently Asked Questions
Can I bypass my garage door sensors in winter?
No. Bypassing sensors removes the safety feature that stops the door from closing on people, pets, or vehicles. Clean and realign them, or call a technician.
Why are my garage door sensor lights blinking?
A blinking light usually means the sensors are misaligned, or the beam is blocked. Clear snow, wipe the lenses, and adjust the brackets until both lights stay steady.
Can I mount my sensors higher to avoid snow?
No. Sensors must stay within the height your opener manufacturer specifies, typically no more than 15 cm (6 inches) above the floor. Higher sensors may miss small children or pets. Clearing snow is the safer fix.
Why does my door only close when I hold the wall button?
Many openers let you close the door by holding the wall button when the sensors are not working. This is a sign of a sensor problem that needs attention, not a permanent fix.
Do you repair garage door sensors outside Guelph?
Yes. We serve Elora, Fergus, Rockwood, Cambridge, Kincardine, Point Clark, Goderich, and nearby areas. Contact us to confirm service in your community.Book Garage Door Sensor Repair in Guelph and Nearby Areas
For more than 40 years, our family-owned team has provided garage door repair in Guelph, Ontario, earning nine Reader’s Choice Awards along the way.
Our long-serving technicians at Wm. Haws Overhead Garage Doors Ltd. know the openers and doors in local homes. We serve Guelph, Elora, Fergus, Rockwood, Cambridge, Kincardine, Point Clark, Goderich, and nearby areas.
Call (519) 763-4297 Monday to Friday, 8 a.m. to 4 p.m.
