Fix it
Garage door sensor blinking
One sensor sends and one receives. The sending one should show a steady light whenever it has power. The receiving one shows a steady light only when it can see the sender. A blinking receiver means the beam is broken, out of line, or the sun is in it.
Do this first
Wipe both lenses with a dry cloth and look along the beam for anything in the way. Half of these are a cobweb or a bin bag.
Need it today?
MF Garage Doors
Door stuck, spring gone, car trapped — ring, do not fill in a form.
Call (863) 592-2143Repairs and service within 40 miles of Sebring — Avon Park, Lake Placid, Wauchula, Arcadia, Lake Wales, Bartow, Frostproof and Winter Haven.
New doors and replacements across central Florida — Tampa, Orlando, Lakeland, Winter Haven, Kissimmee, Clermont, and everywhere between.
3 of 3 are yours to fix
What it usually turns out to be
| Cause | How to tell | What happens next | Yours? |
|---|---|---|---|
| Out of alignment | The receiver blinks or is dark; nudging the bracket makes it go steady. | Loosen the wing nut, aim them at each other until the light is steady, tighten without moving it. | Yes |
| Sunlight in the receiver | Only at certain times of day, only certain months. | Shield the receiver. It is a known limitation of every brand, not a fault. | Yes |
| A damaged wire | The sender light is out too, or it started after work was done in the garage. | The wire is stapled along the wall and is easy to nick. Replace the run rather than patching it. | Yes |
What it costs
$95 – $175
For a sensor pair, fitted. National guide range, checked September 2026 — get it in writing.
Other faults
The repair
What actually happens on the visit
- Cleans both lenses before touching the alignment, because a cobweb reads exactly like a misalignment and costs nothing to rule out.
- Aligns them — same height, facing each other, until the receiver's light stops blinking and stays steady.
- Follows the wire back to the opener terminals, looking for a staple, a nick or a corroded contact.
- Checks for sun straight into the receiver at the time of day it fails, which is a real cause and a seasonal one.
- Replaces the pair only if all of that fails, which is not often.
How long it takes. Fifteen minutes to half an hour. Frequently the cheapest visit on this list, and frequently one you could have done yourself.
Next time
Can you stop it happening again?
Yes, and easily. Wipe the lenses a couple of times a year and keep the corners by the door clear. The sensors are at shin height because that is where a child would be, which is also why they are where a bag gets dumped.