My Garage Door Won’t Open — What to Do Right Now

Danville CA · 94526 · Emergency Guide · 2026

It’s 7:15am. Your car is in the garage. The door won’t open. You have 20 minutes before you need to leave. You press the opener button — nothing. You press again — still nothing. You don’t know if it’s the spring, the opener, the sensors, or something else entirely.

This guide walks you through exactly what to check, in the right order, so you can either fix it yourself in the next 10 minutes or know exactly what to tell the technician when you call.

Step 1 — Check the Opener First

My garage door opener light is on but the door won’t move — what’s happening? The opener has power but something is blocking it from operating. This is almost always one of three things: a tripped safety sensor, a broken spring, or a disengaged trolley. Check in this order before anything else.

First — look at the sensor lights at the bottom of each track. Both sensors should show solid green or solid amber. If one is blinking, the beam is broken or the sensors are misaligned. This is a common cause in Danville — dust and pollen from Las Trampas Regional Wilderness coats sensor lenses faster here than in coastal Bay Area cities. Wipe both lenses with a dry cloth and check if the light goes solid.

Second — look above the door at the torsion spring. It’s the heavy coil mounted horizontally above the door on a steel shaft. If you see a gap in the middle of the spring — a separation between two sections of the coil — the spring is broken. Do not try to operate the door with the opener. A broken spring puts full load on the opener motor and can burn it out in a single cycle.

Third — check the trolley carriage on the opener rail. There’s a red cord hanging from it. If someone pulled that cord recently — or if it got caught on something — the trolley may be disengaged from the door. The door can’t open with a manual release active.

Step 2 — Is the Spring Broken?

How do I know if my garage door spring is broken? Three clear signs: you can see a visible gap in the torsion spring coil above the door, the door feels extremely heavy when you try to lift it manually (torsion springs carry 90–95% of the door’s weight), or you heard a loud bang from the garage — often described as a gunshot — when the spring snapped.

In Danville, spring failures are most common in two windows: July–September when Las Trampas Ridge blocks the marine layer and summer heat hits 100–105°F accelerating metal fatigue, and December–February when atmospheric river storms create rapid temperature swings that stress already-worn springs. “Heard a huge bang from the garage at 6am — thought something fell over. Went out to find the spring snapped in half.” — r/HomeImprovement. That bang is exactly what a torsion spring failure sounds like.

Greenbrook and Sycamore Valley homes built 1982–2005 are at highest risk. Original springs on these homes are now 20–40 years old — two to four times their rated service life. If your home was built before 2000 and you’ve never replaced the springs, they should be inspected at your next tune-up.

If the spring is broken — stop here. Do not use the opener. Do not try to force the door manually. Pull the red emergency release cord to disengage the opener, carefully lift the door just enough to get your vehicle out if you need to, then call (925) 886-0014. Spring replacement in Danville takes 60–90 minutes same-day.

Step 3 — Check the Sensors

Why does my garage door go down then immediately come back up? Safety sensors. Every garage door opener manufactured after 1993 has two infrared safety sensors at the bottom of the tracks. When the beam between them is broken — by an object, a misaligned sensor, direct sunlight, or a dirty lens — the opener reverses before closing.

In Danville this has a specific pattern: west-facing garages in summer experience direct afternoon sunlight hitting the sensor receiver at a low angle, overwhelming the infrared beam and triggering a false obstruction reading. If your door only refuses to close in the afternoon and works fine in the morning, this is almost certainly what’s happening — not a mechanical failure.

My garage door opener is blinking — what does the blink count mean? Count the blinks. Four blinks typically means a sensor alignment issue. Six blinks usually means a wiring fault. The blink count varies slightly by opener brand — LiftMaster and Chamberlain use the same system, Genie uses its own. Call us with your blink count and we’ll diagnose over the phone before dispatching.

Quick DIY sensor fix: loosen the wing nut on the misaligned sensor, aim it directly at its pair until the indicator light goes from blinking to solid, retighten. If the light stays blinking after manual alignment — the issue is wiring, a failed sensor, or sunlight interference. Sensor repair in Danville runs $65–$95 for alignment, $95–$145 for replacement.

Step 4 — Check the Opener

My garage door opener runs but the door doesn’t move — what’s wrong? Three possibilities: the trolley carriage is disengaged from the door (check the red cord), the drive gear inside the opener is stripped (you’ll hear the motor running but no movement from the rail), or the opener is in manual lock mode (some models have a lock feature activated by the wall button).

My garage door remote stopped working — is the opener broken? Not necessarily. Check the wall button first — if the wall button works but the remote doesn’t, it’s the remote (dead battery or lost programming), not the opener. If neither works, check the outlet the opener is plugged into — a tripped GFCI outlet is the most overlooked cause of “dead” openers in Danville garages.

My LiftMaster opener light is flashing but not working. LiftMaster uses light flash codes to indicate specific faults. One flash = sensor fault. Two flashes = short circuit. Ten flashes = door reversal detected. Count the flashes and call — we can typically diagnose the fault over the phone before dispatching a technician.

Step 5 — My Car Is Trapped. What Do I Do Right Now?

My car is trapped in the garage and the door won’t open — what’s the emergency procedure? Every garage door opener has a manual emergency release — a red cord hanging from the trolley carriage on the opener rail, usually with a red handle. Here’s exactly what to do:

1. Pull the red cord straight down. This disconnects the door from the opener trolley. You should hear a click.
2. Lift the door manually from the bottom. With a working spring, a standard residential door should lift with one hand. If it’s very heavy — more than 30–40 lbs of resistance — the spring is broken and the opener was carrying the load.
3. If the door won’t lift even with the manual release pulled: the spring is broken AND the door may be off-track. Don’t force it. Call (925) 886-0014 — we answer 24/7 and will walk you through it on the phone.
4. Once your car is out, lower the door carefully and leave it in manual mode until a technician arrives. Do not re-engage the opener until the underlying issue is fixed.

“Pulled the red cord but door still won’t open — now what?” — r/HomeImprovement. If the door won’t lift after pulling the emergency release, either the spring is broken or the door has come off the track. Both require a technician. Call us — most Danville emergency calls arrive within 2 hours, 24/7 no surcharge.

What’s Causing It — Danville’s Most Common Failures by Season

Why does my garage door break so often in summer? Las Trampas Ridge is the answer. It blocks the coastal marine layer that cools the rest of the Bay Area, creating an inland heat pocket in 94526. Sustained 100–105°F summer temperatures accelerate metal fatigue in springs and cables faster than anywhere else in the Bay Area.

Summer (July–September): Spring and cable failures peak. Heat and humidity cycles cause metal fatigue. Sensor failures also spike — direct afternoon sun on west-facing garages overwhelms infrared beams.

Winter (December–February): Atmospheric river season. Rapid temperature swings between cold rain and warm days stress already-worn springs. Wind gusts near Mt. Diablo loosen track mounting hardware and roller brackets over multiple storm seasons.

Spring and Fall: Opener failures become more common as temperature-related hardware stress shows up in the drive system. This is the best time for an annual tune-up to catch worn hardware before it fails.

Frequently Asked Questions — Garage Door Won’t Open Danville CA