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Garage Door Troubleshooting Checklist

Five minutes, in this order, and you will usually know whether the problem is the opener, the door, or the safety system. Then you can decide whether to do something about it.

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This checklist is ordered by likelihood, not by convenience. The most common causes are at the top because they are the ones that resolve fastest. Work down it and stop when you have your answer.

Updated September 2026

Work down this in order

  1. Check the wall console. Do the lights come on and does the door respond? This one check splits the problem into two entirely different halves.
  2. If the console is dead, check the power. The wall outlet, the GFCI receptacle somewhere on the garage wall, and the breaker. A tripped GFCI is one of the most common causes of a completely unresponsive opener.
  3. If the console works, check the remotes. A flat battery, or a pairing lost after a power cut.
  4. Look for an obstruction. In the path of the door, and between the two safety sensors. Both are common and both are free to check.
  5. Clean both sensor lenses and confirm the units are level, aimed at each other, and firmly mounted.
  6. Try the door by hand from the bottom rail. This is the most useful single test on the list, because it tells you whether the door is the problem or the opener is.
  7. Check for obvious physical damage. A cable hanging slack, a spring that has separated, a door that is visibly leaning or off its rollers.
  8. Listen to it. Where the noise is and when it happens often identifies the part.
  9. Check the visible springs if you have torsion springs. Paint marks closed up or overlapping means call.

What the results tell you

What you foundWhat it means
Console dead, no power at the outletBreaker or supply. Nothing to do with the opener.
Console works, remotes do notRemote battery, pairing, or the receiver. Not the motor.
Remotes work, console does notThe wall console or its wiring.
Everything responds, door will not closeThe safety path. Clean and align the sensors first.
Opener runs, door does not moveThe drive or the door. Check rollers and track before the chain or belt.
Door moves easily by hand, opener does not move itThe opener. Capacitor, drive, board, or motor.
Door will not lift by hand at allSprings, cables, or rollers. Call.
Door lifts then slams downSprings are not holding it. Call, and do not keep operating it.

Where to stop and call

Also stop and call if:

  • You hear a bang and the door drops or slams.
  • You can see a cable hanging slack, or a spring that has separated.
  • The door is off its rollers, or visibly bent.
  • The door is heavy by hand and will not lift.
  • The opener hums and stalls, or runs hot.
  • The door will not close and leaves the garage open.

Worth writing down before you call

These are the details that make a call genuinely useful, and they take two minutes to gather:

  • The brand and model of the opener, from the motor housing if you can reach it safely.
  • Whether the door is open or shut right now.
  • Whether it stopped suddenly or has been getting worse — this changes the diagnosis substantially.
  • Whether the door moves by hand, and how it feels.
  • Where the noise is and when it happens.
  • Whether there is torsion or extension springs, if you can tell from inside the garage.
  • How old the door is, or roughly when it was installed, if you know.

A short video of the door running is worth more than a long description. If you can take one safely, without standing in the path of the door, it frequently settles the diagnosis without a second visit.

Want it looked at properly?

If you have worked through a guide and the door is still misbehaving, that is useful information rather than a wasted afternoon. Tell us what you found and we will start from there.

  • Call any hour — day, night, weekend or holiday
  • Urgent situations take priority
  • Straight answers on what is actually broken
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FAQ

Checklist questions

What is the first thing to check on a garage door?

Whether the wall console works and the door responds to it. That single check divides the problem into two entirely different halves. If the console works, the problem is the remote or the safety system. If it does not, the problem is the power, the opener, or the door — and the opener is the least likely of those three.

Why does my garage door stop and reverse?

The opener has detected an obstruction it cannot see. A misaligned sensor is the most common cause. If the sensors are aligned, look at the door for a bent panel, a delaminated section, a dirty track, or a roller out of its groove. If it always happens at the same point in the travel, the cause is the door rather than the sensor.

How do I know if it is the opener or the door?

Lift the door by hand from the bottom rail. If it moves easily, the door and its balance are fine and the opener is the problem. If it is heavy, will not lift, or slams straight back down, the door or its springs or cables are the problem. That test answers most cases on its own.

What should I never adjust on a garage door?

The springs. Not to adjust, not to wind, and not to replace. Also avoid working on extension spring cables, removing the opener cover, and loosening the torsion tube or its brackets. This is where the stored energy is, and it is where essentially every serious garage-door injury happens.

Is it worth trying things before calling?

Yes, the checklist on this page resolves a large share of calls in about five minutes, and none of it is risky. Beyond the checklist, the value falls away quickly. Once you are into springs, cables, or anything inside the mechanism, a call is the better decision — not because we would rather be paid, but because the failure mode is a door coming down.

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