Garage Door Sensor Repair in Mokena, IL
If your door reverses right before it closes — or the opener light blinks and it won’t shut at all — the safety sensors are almost always the reason. Foremost sets them right.
Mokena, IL · Open 7 days · 7 AM—9 PM
What your safety sensors do
Near the bottom of each track, about six inches off the floor, sit two small photo-eye sensors. They shine an invisible beam across the opening, and if anything breaks that beam while the door is closing — a pet, a bike, a child — the door stops and reverses. They’ve been a required safety feature on every opener sold since 1993, and they’re the single most common reason a garage door refuses to close.
The good news: sensor problems are usually quick and inexpensive to fix. The frustrating part is that a misaligned sensor produces the same symptom as a dozen other issues, so it helps to have someone who knows exactly what to check.
Signs it’s your sensors
- The door starts to close, then reverses back up
- The opener light blinks several times and the door won’t close
- One sensor light is off or flickering
- The door only closes if you hold the wall button down
- A green/red steady light turned red or went dark
- It started after something bumped a bracket near the floor
How we fix sensor problems
Our technician checks the alignment of both photo-eyes, cleans the lenses, tightens or replaces loose brackets, and inspects the wiring back to the opener — rodents and lawn tools are surprisingly common culprits. If a sensor itself has failed, we replace it. Then we test the door closing several times and confirm the safety reverse works, because a door that closes but won’t reverse on an obstruction is genuinely dangerous.
Sensor trouble often shows up alongside other opener issues — if that’s the case we’ll flag it. See our opener repair page.
Sensor repair pricing
Sensor realignment and repair is one of our most affordable visits, and we’ll always tell you honestly if that’s all your door needs rather than selling you more. We confirm the price over the phone — see the pricing page.
Frequently asked questions
Why does my garage door reverse before closing?
Almost always misaligned or dirty photo-eye sensors near the floor. The door “thinks” something is in the way and reverses for safety. We realign and test them.
What do blinking opener lights mean?
A blinking opener light usually signals the safety sensors are blocked or out of alignment. Once the beam is restored, the door closes normally.
Can I just disable the sensors?
No — they’re a required safety feature that stops the door on a person, pet, or object. We fix them rather than bypass them.
How much does sensor repair cost?
It’s one of our most affordable services. We confirm the exact price over the phone; realignment is quick and inexpensive.
Why is one sensor light off?
A dark sensor light means it’s misaligned, unplugged, dirty, or the wiring is damaged. We’ll find which and correct it.
Can sensors fail from weather or age?
Yes. Moisture, corrosion, spider webs, sun glare, and damaged wiring can all cause sensor faults over time.
How long does a sensor fix take?
Most sensor repairs take well under an hour, including testing the safety reverse.
Do you work on all opener brands’ sensors?
Yes — LiftMaster, Chamberlain, Genie, Craftsman, and others. Sensor systems are similar across brands.
It’s usually a 20-minute sensor fix
Serving Mokena and the Southland, 7 days a week, 7 AM to 9 PM.