September 2, 2026 · 4 min read
Why your garage door won’t close (and what to check first)
A door that goes down a foot and rolls straight back up is not broken in the way most people assume. The opener is doing exactly what it was designed to do: something told it the path was not clear, so it reversed.
Here is the order we check things in when we get this call, starting with what you can safely look at yourself.
Start with the safety sensors
Two small eyes sit about six inches off the floor on each side of the opening. They have to see each other for the door to close. If one is bumped out of line, dusty, or blocked by a bike tire or a bag of soil, the opener refuses to bring the door down.
- Look for a steady light on both sensors. A blinking or dark light means they are not aligned.
- Wipe both lenses with a dry cloth. Utah dust and cobwebs are the most common cause we see.
- Move anything stored near the track, even a few inches into the beam counts.
- Gently nudge a loose sensor until the light stops flickering, then tighten the wing nut.
Hold the wall button down
Most wall consoles will close the door while you hold the button, bypassing the sensor beam. If the door closes that way, the sensors are your problem. If it still refuses, the issue is mechanical or in the opener logic.
Never leave the door closing unattended when you bypass the sensors, and do not tape the sensors into position as a permanent fix.
Look at the track and rollers
A door that stops at the same point every time is usually catching on something. Check the tracks for a dent, a loose bracket, or a roller that has jumped its groove. A bent track can often be straightened, but a door running out of square needs a technician before it damages panels.
Check the close limit on the opener
If your door touches the floor and then reverses, the opener thinks it hit an obstruction. That is a travel-limit setting, adjustable with the dials or buttons on the opener head. Small adjustments only, and test after each one.
When to stop and call
Stop if you see a gap in the spring above the door, a frayed cable, or a door that feels heavy when lifted by hand with the opener disconnected. Those are under high tension and are not a homeowner repair.
Frequently asked questions
- Why does my garage door close and then immediately open again?
- The opener sensed an obstruction. Usually the safety sensors are misaligned or dirty, or the close-travel limit is set too far so the door presses into the floor and reverses.
- Can I close my garage door with a bad sensor?
- Yes, temporarily. Hold the wall button down to close the door while you watch it. Keep the opening clear and get the sensors repaired, since they are the main safety feature protecting people and pets.
- How much does sensor repair cost?
- It depends on whether the sensors need realignment, new wiring, or replacement. We diagnose on site and quote before starting the work.
