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How Garage Door Sensors Work

Garage door safety sensors (photo-eye sensors) are mounted near the bottom of the tracks on either side of the door.

One sensor emits a continuous infrared beam; the other receives it:

  • If the beam is clear, the door closes normally
  • If the beam is interrupted, the door stops and reverses

This system is required on all modern garage doors and is designed to prevent injury or damage.

When sensors become misaligned, dirty, or electrically unreliable, the system assumes something is in the way, even when nothing is there.

Types of Garage Door Sensor Problems

Not all sensor issues are the same, and identifying the root cause matters.

Misalignment

Even a slight shift (often caused by vibration or accidental bumps) can break the signal between sensors.

Dirty or obstructed lenses

Dust, cobwebs, road salt residue, and moisture buildup are common in Ottawa garages and can weaken the sensor beam.

Wiring issues

Loose connections, worn insulation, or moisture exposure can cause intermittent or complete sensor failure.

Sunlight interference

Direct sunlight hitting a sensor lens can overwhelm the receiver, creating false signals at certain times of day.

Aging or failed sensors

After 10-15 years of use, sensors can become unreliable, especially in garages exposed to Ottawa’s temperature extremes.

Residential double garage door on an Ottawa home
Technician adjusting a garage door photo-eye sensor mounted on the track

Signs You Need Garage Door Sensor Repair

You’re likely dealing with a sensor issue if:

  • The garage door won’t close unless you hold the wall button
  • The door starts to close, then reverses immediately
  • Sensor lights are blinking, dim, or completely off
  • The door works inconsistently throughout the day
  • The door refuses to close even when nothing is in the way

These issues typically don’t resolve on their own and often become more unpredictable over time.

Our Garage Door Sensor Repair Services

We handle everything from simple adjustments to full replacements.

Sensor Realignment

Even minor shifts in sensor position can break the beam. We realign and calibrate both sensors precisely so they communicate reliably again.

Lens Cleaning

Dust, cobwebs, and road salt residue can weaken or block the signal. We clean the lenses and remove any obstructions affecting sensor performance.

Wiring Inspection & Repair

Loose connections and worn insulation are a common cause of intermittent sensor failure. We inspect the full wiring run and repair any faults.

Intermittent & Time-of-Day Issue Diagnosis

Some sensor problems only appear at certain times or under specific conditions. We test systematically to identify the root cause rather than guessing.

Sensor Replacement

When sensors are too worn or damaged to repair reliably, we replace them with compatible units for your opener brand and model.

Why Homeowners in Ottawa Choose Us

When a garage door sensor fails, you don’t just need a quick fix. You need the right fix the first time.

Excellence Award for Garage Door Opener Services in Ottawa by Capital Garage Door Ottawa

25 Years of Local Experience

We’ve been repairing garage doors in Ottawa since before most of our customers moved into their homes. That experience means faster diagnosis, fewer surprises, and repairs that hold up.

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Diagnosis You Can Rely On

We don’t replace parts on guesswork. Sensor issues are tested and confirmed before any repair is recommended, so you’re only paying for what’s actually needed.

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Repairs Completed in a Single Visit

Our vehicles are fully stocked with sensors, wiring components, and hardware for all major brands. In most cases, we diagnose and resolve the issue on the same visit.

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No Unnecessary Replacements

If your sensors can be repaired, we repair them. Replacement is only recommended when it’s the most reliable and cost-effective option.

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Licensed, Insured Technicians

Every repair is carried out by a licensed and insured technician. Garage door sensors are a safety-critical system, and this isn’t work to leave to chance.

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Built for Ottawa Conditions

Garages in Ottawa deal with dust, humidity, road salt, and extreme seasonal shifts. We account for these factors when diagnosing and repairing sensor issues, ensuring your system holds up through every season.

Not Sure What's Wrong With Your Sensor?

We’ll diagnose the issue and give you a clear answer before any work begins. You’ll know exactly what the issue is, what it takes to fix it, and what it will cost before any work starts.

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Frequently Asked Questions

Areas We Serve

We provide garage door sensor repair throughout Ottawa and the surrounding area, including:

How much does garage door sensor repair cost?

Simple fixes like realignment and lens cleaning are typically quick and among the more affordable garage door repairs. Wiring repairs involve more time and materials, and full sensor replacement will cost more depending on the sensors required for your opener. You’ll receive a clear estimate before any work begins so there are no surprises.

What do the lights on my garage door sensors mean?

Each sensor has an indicator light. On most systems, the sending sensor (emitter) has a steady amber light, and the receiving sensor has a steady green light when everything is working correctly. A blinking or off light on either sensor usually means the beam is broken, the sensors are misaligned, or there is a wiring fault. If your lights are anything other than steady, that’s a reliable sign the sensors need attention.

Why is my garage door closing fine in the morning but not in the afternoon?

This is almost always sunlight interference. When direct sunlight hits the receiving sensor lens at certain times of day, it can overwhelm the sensor and cause it to behave as though the beam is broken, even when nothing is in the way. Repositioning or shielding the sensor typically resolves it. It’s one of the more confusing symptoms because the door seems to work intermittently for no obvious reason.

Can garage door sensors be repaired instead of replaced?

Yes, in many cases. Alignment issues, dirt buildup, and wiring faults can often be fixed without replacing the sensors. Replacement is only recommended when the sensors are no longer functioning reliably and repair isn’t a cost-effective option.

How long do garage door sensors last?

Most sensors last 10-15 years, but exposure to moisture, dust, road salt, and temperature extremes can shorten their lifespan, particularly in uninsulated garages. If your sensors are approaching that age range and becoming unreliable, replacement is worth considering.

Can I replace garage door sensors myself?

It’s possible, but there are a few practical reasons it often goes wrong. Sensors need to be precisely aligned to within a very small margin, the wiring connections need to be correct, and replacement sensors must be compatible with your specific opener brand and model. Using the wrong sensors or getting the alignment slightly off can result in ongoing issues or a door that won’t close at all. Professional installation removes that uncertainty.

Get Your Garage Door Working Again

If your garage door isn’t closing properly, don’t wait. Sensor problems rarely fix themselves and often get worse with time.

Capital Garage Door Ottawa has provided trusted sensor repair across Ottawa for over 25 years, with same-day service available 7 days a week and most repairs completed in a single visit.

Call now: (613) 604-9779 or request your free estimate online. We’ll diagnose the problem, explain your options clearly, and get your door working safely again.

Contact Us Today

If you need garage door services, please contact us today. We would be happy to answer any concerns or questions you have and provide you with a free quote.

CALL NOW: (613) 604-9779