In short
- HomeStars' Canada-wide guide prices a sensor repair at $50–$75, for misaligned or damaged sensors.
- One Calgary firm lists $120–$180 plus GST to realign a pair and $180 plus GST to replace it.
- Under the US opener standard, the opener checks the sensors on every close; a broken wire stops an open door from closing more than a foot.
- Openers made before 1993 lack the photo-eyes now required, and HomeStars says to replace them.
Typical prices in Ottawa
| Job | Typical range | Notes |
|---|---|---|
| Sensor repair, misaligned or damaged | $50–$75 | HomeStars Canada-wide guide |
| Opener repair: sensors, gears or motor | $150–$350+ | One Ottawa firm’s published list |
| Sensor cleaning and realignment | $120–$180 + GST | One Calgary firm’s published list |
| Sensor pair replaced | $180 + GST | Same Calgary list; wiring where needed |
| New opener, installed | $400–$900 | HomeStars Canada-wide guide; for an opener without photo-eyes |
Sources. HomeStars, How Much Does Garage Door Repair Cost?, Canada-wide, seen 29.10.2026. HomeStars, Garage Door Installation Cost in Canada, updated 21.08.2026, seen 29.10.2026. HomeStars, A Guide to Garage Door Opener Installation, published 06.08.2026, seen 29.10.2026. One Ottawa firm’s published list: Ottawa Homeowners’ FAQ: Garage Door Repair Costs Explained, published 25.08.2025, seen 29.10.2026. One Calgary firm’s published list: Garage door sensor repair and replacement, Calgary, seen 29.10.2026. Safety rules and guidance: US eCFR, 16 CFR Part 1211, Safety Standard for Automatic Residential Garage Door Operators, seen 29.10.2026; US CPSC, Non-Reversing Automatic Garage Door Openers Are a Hazard, seen 29.10.2026; DASMA, Garage door opener safety tips, seen 29.10.2026; Chamberlain support, troubleshooting the safety reversing sensors, seen 29.10.2026; Craftsman opener manual, safety reversing system, seen 29.10.2026. Contracts: Ontario, guide for home renovation businesses, seen 29.10.2026.
How the two eyes decide
A photo-eye pair sits low on either side of the door. The sending eye throws an invisible beam across the opening and the receiving eye watches for it. If anything breaks the beam while the door is coming down, the door stops, travels back up to full open, and the opener lights flash, one opener manual explains.
Under the US federal opener standard, 16 CFR Part 1211, the opener checks that the sensor is present and working on every close. If the eye is missing, or a wire has an open or short circuit, a closing door goes back up and an open door will not travel more than a foot down. For the wider picture of a door that stays up, see garage door won’t close.
Reading the lights for your request
On one large maker’s sensors, the sending eye shows an amber light and the receiving eye a green one, both steady when the beam is clear. When one is off or flickering, that maker’s support page lists three causes: the beam is blocked or the eyes are out of line, a sensor has failed, or a sensor wire is shorted or broken. Each needs different parts. Other brands use other colours, so write what you see: “left light steady orange, right light blinking green”.
Sun glare and the time of day
An opener manual says either eye can go on either side of the door, as long as the sun never shines directly into the receiving lens. When it does, the receiver reads the sun as a broken beam and the door reverses. Sun shields that fit over the sensors are sold for this.
The tell is the clock. An east-facing garage can act up in the morning, a west-facing one late in the day. Through an Ottawa winter the sun stays low, so light reaches deeper into an open garage. Put the time and the direction your door faces in the request. The usual fixes are swapping the eyes so the receiver sits on the shaded side, or a shield.
Height, mounting and Ottawa winters
DASMA, the association of door and opener makers, sets the six-inch rule: the eyes no higher than six inches above the floor, so a person or a pet cannot pass under the beam undetected. The opener manual asks for brackets fastened to solid framing and a beam path that no part of the door or track can cross.
Slush off the tires can collect at the threshold, at beam height. A bracket knocked by a shovel or a recycling bin can push the eyes out of line, and the door stops closing. Sensors raised above the snow break the six-inch rule. Mention it if the eyes were moved, taped or tied to the track.
The reversing test, and when the opener is the problem
Photo-eyes are the second line of protection. Under the US standard, a closing door must also start to reverse within two seconds of touching an obstruction. The US Consumer Product Safety Commission uses a 2x4 laid flat in the door’s path, and says a door that fails should come off the opener until it is adjusted, repaired or replaced. Ask the company to run the test with you watching before it leaves.
Sometimes new sensors will not cure it. One Calgary firm notes that on older openers a worn logic board can mimic a sensor fault. An opener made before 1993 lacks photo-eyes altogether and should go. Our pages on the opener itself and on opener installation cover that decision.
What the quote should list
The quote should say which job you are paying for. A realignment with a wiring check is the smallest: $50–$75 on HomeStars’ guide, $120–$180 plus GST on one Calgary firm’s list. A new pair is $180 plus GST on that list. One Ottawa firm lists opener repairs, sensors included, at $150–$350 and up. The quote names the fault, parts, labour, any shield, the reversing test and HST. HomeStars flags extras: after-hours fees, travel and disposal of old parts.
Ontario requires a written agreement for home repair work over $50. If an estimate forms part of the contract, the final price can rise by no more than 10% without your signed approval.
Who receives your request
Ottawa Garage Door Desk is a request service. We pass what you write in the form to one independent local garage door company, which calls you back, looks at the sensors, wiring and opener, prices the repair and does the work.
Questions to ask the company
- Is the fault in the sensors, the wire between them and the opener, or the opener itself, and how did you tell?
- Can you realign the pair I have, or do both need replacing, and what does each option cost with HST?
- If the sun is the cause, will you move the receiving eye or fit a shield, and is that in the price?
- Will you run the reversing test with me in the garage before you leave?
- If my opener is too old for new sensors, what does a replacement unit cost installed?
Have this ready for the call
- The colour of each sensor light and whether it is steady, blinking or off
- Whether the door goes down when you hold the wall button, and whether the opener lights flash
- The time of day the fault shows up, and which way the garage door faces
- A photo of each sensor and of its wire
- The brand and model from the label on the opener's motor unit
- Anything that changed lately: a bump, new shelving, a door or opener job
Questions people ask
The door closes when I hold the wall button, but the remote only makes it bounce back. Why?
The US opener standard lets a door close on constant pressure from a control mounted in sight of the door, and one large maker calls holding the wall control a temporary measure until the sensor fault is found. Put this in your request: it points the company at the sensors.
It closes fine at night and reverses on sunny afternoons. Is the opener failing?
The pattern matches sun glare. An opener manual places the sensors so the sun never shines straight into the receiving eye, and sun shields are sold to stop accidental reversal. Write down the time of day and which way the garage faces.
Can the sensors be switched off so the door just works?
The opener manual calls the safety reversing sensor a required safety device that cannot be disabled, and under the US standard an opener that finds a sensor fault will not lower an open door more than a foot.
My opener has no sensors at all. Can they be added?
HomeStars says openers made before 1993 lack the photo-eyes now required and should be replaced whatever their power. HomeStars puts a new unit at $400–$900 installed.
Do new sensors come with a new opener?
HomeStars lists the photo-eye pair among the parts required on every opener installation. Ask whether the quote includes the pair, the wire run and the test at the end.
