Short answer: Before you assume the worst and dial for help, a surprising number of garage door failures come down to something small: a bumped switch, a spider web across a sensor, or a driveway-parked car reflecting a beam. This checklist walks you through the safe, no-tools-required checks in the order a technician would, so you either fix it yourself in five minutes or arrive at the call knowing exactly what's wrong.
Before you assume the worst and dial for help, a surprising number of garage door failures come down to something small: a bumped switch, a spider web across a sensor, or a driveway-parked car reflecting a beam. This checklist walks you through the safe, no-tools-required checks in the order a technician would, so you either fix it yourself in five minutes or arrive at the call knowing exactly what's wrong.
Start with power and the remote
Work from the simplest cause outward. First, does the wall button inside the garage work when the remote doesn't? If the wall button works, you're likely looking at a dead remote battery, a remote that lost its programming, or something blocking the signal, so swap the battery and re-pair the remote per the opener's instructions. If nothing works from either control, check that the opener is still plugged in (vibration and bumps loosen plugs over time) and that the outlet has power. Test the outlet with a phone charger or lamp, and reset the GFCI or the breaker if it's tripped, which happens more often in garages exposed to Daly City's damp air. Also look for a vacation or lock button on the wall console; it's easy to press by accident, and it disables the remotes on purpose. If the opener motor hums or its light blinks but the door doesn't move, note that behavior, because it points toward a mechanical problem rather than an electrical one.
Check the door, the sensors, and the track
If the door won't close (or reverses right after touching the floor), the photo-eye sensors near the base are the usual suspect. Look for a steady indicator light on each; a blinking or dark light means they're misaligned or blocked. Wipe the lenses, clear cobwebs and leaves, and gently nudge one bracket until both lights hold steady, a genuinely DIY fix. If the door is crooked, hanging at an angle, or the rollers have popped out of the metal track, stop operating it; a door that's off-track can fall, and forcing the opener will bend things further. Look, too, for an obvious broken torsion spring above the door: a clean gap or a visible split in the coil. If you see one, do not try to lift the door and do not keep pressing the opener, which can burn out the motor trying to haul a door the spring is no longer helping lift.
When the checklist runs out
If you've confirmed there's power, the sensors are clean and aligned, nothing is jammed, and the door is on its track but still won't budge, or if you spotted a broken spring, cable, or an off-track door, you've reached the point where hands-on repair means dealing with high-tension parts, and that's a professional's job rather than a DIY one. The upside is that you're no longer guessing. You can describe the exact symptom (dead on both controls, reverses on close, visible spring gap, grinding motor) and get a straight diagnosis instead of a vague one. Manually releasing the door with the red emergency cord will let you get your car in or out in the meantime; just do it only when the door is fully down, since releasing it while raised can let an unbalanced door drop.
Frequently Asked Questions
Start with power and the remote?
Work from the simplest cause outward. First, does the wall button inside the garage work when the remote doesn't? If the wall button works, you're likely looking at a dead remote battery, a remote that lost its programming, or something blocking the signal, so swap the battery and re-pair the remote per the opener's instructions. If nothing works from either control, check that the opener is still plugged in (vibration and bumps loosen plugs over time) and that the outlet has power. Test the outlet with a phone charger or lamp, and reset the GFCI or the breaker if it's tripped, which happens more often in garages exposed to Daly City's damp air. Also look for a vacation or lock button on the wall console; it's easy to press by accident, and it disables the remotes on purpose. If the opener motor hums or its light blinks but the door doesn't move, note that behavior, because it points toward a mechanical problem rather than an electrical one.
Check the door, the sensors, and the track?
If the door won't close (or reverses right after touching the floor), the photo-eye sensors near the base are the usual suspect. Look for a steady indicator light on each; a blinking or dark light means they're misaligned or blocked. Wipe the lenses, clear cobwebs and leaves, and gently nudge one bracket until both lights hold steady, a genuinely DIY fix. If the door is crooked, hanging at an angle, or the rollers have popped out of the metal track, stop operating it; a door that's off-track can fall, and forcing the opener will bend things further. Look, too, for an obvious broken torsion spring above the door: a clean gap or a visible split in the coil. If you see one, do not try to lift the door and do not keep pressing the opener, which can burn out the motor trying to haul a door the spring is no longer helping lift.
When the checklist runs out?
If you've confirmed there's power, the sensors are clean and aligned, nothing is jammed, and the door is on its track but still won't budge, or if you spotted a broken spring, cable, or an off-track door, you've reached the point where hands-on repair means dealing with high-tension parts, and that's a professional's job rather than a DIY one. The upside is that you're no longer guessing. You can describe the exact symptom (dead on both controls, reverses on close, visible spring gap, grinding motor) and get a straight diagnosis instead of a vague one. Manually releasing the door with the red emergency cord will let you get your car in or out in the meantime; just do it only when the door is fully down, since releasing it while raised can let an unbalanced door drop.
How do I get help with this?
Call (650) 623-1311 and describe the situation, your exact location, and what you need. Timing is confirmed on that call rather than promised in advance.
Call for help: (650) 623-1311 — a straight answer and an honest estimate before any work begins.