From $180 · Same-Day Fix · No Weekend Fees
Garage Door Sensor Repair & Replacement — Edmonton
What Garage Door Safety Sensors Do
They're a federal safety requirement — and the most misunderstood part of your garage door system.
Every garage door opener manufactured after 1993 is required by law to have safety reversal sensors. These are the two small devices mounted 6 inches off the ground on either side of the door opening. One sends an infrared beam, the other receives it. If anything breaks that beam while the door is closing — a person, a pet, a bicycle — the door immediately reverses.
When sensors malfunction, your door will either refuse to close entirely (blinking opener light), close partway and reverse, or — in the worst case — close without safety protection. All of these need attention, but only one is actually dangerous. We diagnose which is happening and fix the actual problem.
Here's what makes us different on sensor calls: we don't walk in assuming you need a new opener. We've seen too many Edmonton homeowners pay $780+ for an opener replacement when the issue was a $120 sensor alignment or a $5 LED bulb interfering with the infrared signal. We check the simple things first because that's the honest thing to do.
Common Sensor Problems We Fix in Edmonton
Most of these are same-day fixes at $120–$180. Some are free (like the LED bulb issue).
Misalignment
The most common issue. Sensors get bumped by feet, bikes, or brooms. One sensor shifts a few millimetres and the beam doesn't connect. We realign and secure both sensors — takes 10 minutes, included in the service call.
Ice & Snow Blockage
Edmonton-specific: snow blows into the garage and covers the lower sensor, or ice builds up on the lens. The door won't close because the beam is physically blocked. Clear the sensor and it works again — but if it's happening repeatedly, the seal or threshold needs attention.
Sun Interference
In summer, direct sunlight can overwhelm the infrared receiver — especially on south-facing and west-facing garages in the late afternoon. The door refuses to close during specific hours. We can reposition or shield the sensor to eliminate this.
LED Bulb Interference
This catches a lot of people off guard. Certain LED bulbs emit infrared light that interferes with the sensor signal. Your opener light works fine, your sensors look fine, but the door won't close. Swap the LED bulb for a compatible one — problem solved, $0 parts cost.
Wiring Damage
Sensor wires run along the tracks at floor level — exactly where they get snagged by tools, crushed by storage items, or chewed by rodents. A break anywhere in the wire kills the sensor circuit. We trace and repair or replace the wiring.
Failed Sensor Unit
After 10–15 years, sensor electronics fail. The LED goes out entirely or becomes intermittent. We replace both sensors as a pair — they're designed to work together and mixing old with new causes reliability issues. Full replacement with 1-year warranty.
Sensor Repair Prices — Edmonton (2026)
No diagnostic fee. No weekend surcharge. We diagnose the actual problem and fix it — not replace the whole opener.
| Service | Price (+ GST) | Same-Day? |
|---|---|---|
| Sensor Alignment & Adjustment | $180 | Yes |
| Sensor Replacement (pair) | $180 | Yes |
| Wiring Repair/Replacement | $180 | Yes |
| LED Interference Diagnosis | Included in service | Yes |
| Sensor + Maintenance Combo | $120–$180 | Yes |
Compare that to the $780+ opener replacement some companies will quote you for the same symptoms. We check the sensors first because 70% of “door won't close” calls turn out to be sensor issues — not opener failures.
Quick Troubleshooting Before You Call
Try these first — you might fix it yourself in 30 seconds.
Check for obstructions
Look for anything in the door's path — box, broom, toy. Even a spiderweb across the sensor beam can trigger a reversal.
Clean the sensor lenses
Wipe both sensor lenses with a dry cloth. Dust, cobwebs, and condensation are common causes of intermittent failures.
Check sensor LEDs
One sensor should have a steady green LED (receiver), the other a steady amber/orange (sender). If the green is blinking or off — that sensor is misaligned or faulty.
Check for LED bulb interference
If you recently installed LED bulbs in the opener unit or nearby, try removing them temporarily. Some LED bulbs emit infrared that conflicts with the sensor beam.
Try holding the wall button
Holding (not pressing) the wall button forces the door to close, bypassing sensors. If this works, the sensors are the issue — not the opener motor.
If none of these fix it, call us. We'll diagnose it same-day and have it working before you go to bed. No diagnostic fee — the $180 service price covers everything.
Edmonton Areas We Serve
Sensor Repair FAQ — Edmonton
Sensor repair, alignment, or replacement costs $180 + GST. This includes diagnosis, parts (if needed), and a 1-year warranty. No diagnostic fee, no service call fee, no weekend surcharge.
Opening doesn't use the safety sensors — only closing does. If the door opens but won't close (or reverses immediately), the sensors are the first thing to check. Misalignment, obstruction, dirty lens, or LED interference are the most common causes. 70% of these calls are $120 fixes.
Yes — this is surprisingly common. Certain LED bulbs emit infrared light at frequencies that conflict with the sensor beam. The door won't close even though sensors look perfectly aligned. Swapping to a compatible bulb fixes it instantly. We've seen this fool other companies into replacing the entire opener.
Check the LEDs. The sending sensor (usually amber) should be solid. The receiving sensor (usually green) blinks when misaligned. Also try holding (not pressing) the wall button — if the door closes when you hold it, the sensors are the issue.
Not always. If the door goes all the way down and then reverses, it's usually a force limit issue — the opener thinks it hit an obstruction. If the door reverses before reaching the floor, it's sensors. We diagnose both on the same visit.
Yes. Since 1993, all residential garage door openers sold in North America must have auto-reverse safety sensors. If your opener doesn't have them, it doesn't meet current safety standards. We can install sensors on older openers or recommend replacement if the opener can't support them.
Ice and snow can physically block the sensor beam. Condensation fogs the lens. Extreme cold can cause wiring insulation to crack, creating intermittent connections. And thermal expansion/contraction can gradually shift sensor brackets out of alignment over a season.
If the sensors are under 10 years old and the issue is alignment or wiring — repair. If the sensor unit itself has failed (LED won't illuminate, intermittent even after cleaning/alignment), replacement is the way to go. We replace as a pair since they're matched components.
About the Author
Stan Klugman | Founder, Garage Door Fix
Stan founded Garage Door Fix in 2019. Sensor issues are the most misdiagnosed problem in the industry — we've saved hundreds of Edmonton homeowners from unnecessary opener replacements by checking the $120 fix before recommending the $780 one. 32,000+ completed jobs. 450+ five-star Edmonton reviews.
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Door Won't Close? It's Probably the Sensors.
Most 'opener problems' are $120 sensor fixes. We check the simple things first — because that's the honest thing to do.