A garage door that won't open is one of those problems that always seems to happen at the worst time — usually when you're running late or it's freezing outside. Before you call for service, run through these checks. Some have quick fixes you can handle yourself.
Start With the Obvious
- Check the power. Is the opener plugged in? Check the outlet and the circuit breaker for the garage circuit. A tripped breaker is one of the most common causes of an opener that suddenly "dies."
- Try the wall button. If the wall button works but the remote doesn't, the problem is the remote or its batteries — not the opener or door.
- Replace remote batteries. Standard garage door remotes run on CR2032 or AA batteries. Weak batteries cause intermittent response before they fail completely.
- Check for an accidental lock. Most wall-mounted keypads have a lock feature that disables remote access. Look for a lock button on the wall control and make sure it's not activated.
Check the Safety Sensors
Every garage door opener installed since 1993 has safety sensors near the floor on each side of the door opening. If these sensors are blocked, misaligned, or dirty, the opener will refuse to close the door — and on some models, it affects opening too.
- Look for a solid green light on the receiving sensor (usually the one on the right) and a solid amber light on the sending sensor.
- If either light is blinking, the sensors are out of alignment or something is blocking the beam.
- Wipe the lenses clean. Colorado dust and debris build up on the sensor eyes and interrupt the beam.
- Check that nothing is blocking the path between the sensors — even a leaf or a small toy can trigger the safety beam.
Look for the Red Disconnect Cord
A red rope or cord hanging from the opener rail is the manual release. If it was accidentally pulled — by a child, a stored item, or vibration — the door is disconnected from the opener and won't respond to the motor. Pull the cord toward the door to re-engage the trolley, then try the opener again.
Try to Lift the Door Manually
With the opener disconnected via the red cord, try lifting the door by hand from the inside. A properly balanced door should lift smoothly and stay at about waist height without help. If the door feels extremely heavy, falls back down, or won't move at all, there is likely a broken spring — and that's a call for a technician.
Listen for the Opener Motor
Press the button and listen. If the motor runs but the door doesn't move, the trolley may be disengaged or the drive system (belt, chain, or screw) may have an issue. If the motor makes a humming or grinding sound without movement, stop pressing the button — forcing a jammed opener can cause additional damage.
When to Call Metro Denver Garage Door
If you've checked all of the above and the door still won't open, it's time to call a technician. Situations that always require a professional: a broken spring, a bent or damaged track, a snapped cable, or an opener that won't respond to any input. Call us at (303) 988-4801 and we'll give you a realistic service window for your location.
