Repair or Replace the Garage Door Motor? How to Tell
Most garage doors that 'need a new motor' do not. A door that has gone heavy, a track that is out of line and a sensor that keeps tripping all look like motor faults from the driver's seat. This guide separates the faults that belong to the motor from the faults that belong to the door, and sets out which motor faults are normally worth repairing.
First: is the door heavy, or is the motor weak?
- Release the door from the opener - most units have a red cord or a lever on the rail - and lift the door by hand. A correctly balanced door should lift with one hand and stay where you leave it, halfway up.
- If the door is heavy, drops on its own, or needs two hands, the springs are not carrying the weight. A new motor fitted to that door will fail the same way the old one did.
- If the door lifts easily by hand and the motor still grinds, stalls or trips, the fault is genuinely in the opener or its settings.
- A door that is heavy is also a safety problem. Do not keep running it while you decide - a spring under load is not a homeowner job.
The faults that are usually worth repairing
- A remote that has stopped working: the battery, the remote itself, or the receiver. Cheap to check and cheap to fix.
- A single click and no movement: often the capacitor or the control board rather than the motor winding, and usually repairable.
- Limit settings that have drifted, so the door stops short or closes too hard. This is an adjustment, not a part.
- A worn drive gear, a slack chain or a belt that has stretched. These are service parts and are meant to be replaced.
- A dead backup battery after load-shedding, where the unit otherwise works on mains.
The faults that usually mean a replacement
- A burnt motor winding after a long period of running against a heavy door. The motor was doing work the springs should have been doing.
- A control board that is no longer made or no longer available for that model.
- A unit that has been repaired twice for the same fault in a short space of time, where the parts cost is approaching the price of a new unit. Ask for both numbers before you decide.
- An opener so old that no safety reversal is fitted, or the safety beam cannot be made to work.
- A very light door with an oversized unit, or a heavy door with an undersized one, where the mismatch is the cause of the repeated failures.
Why the door has to be balanced before the motor is judged
- An opener is rated by the force it can apply, and it is designed to move a balanced door, not to lift a dead weight.
- A door out of balance wears the opener's gear, chain and motor, and it also defeats the safety reversal - the opener cannot tell the difference between a heavy door and an obstruction.
- So the order is: springs and balance first, then the door's track, rollers and hinges, and only then the motor.
- A contractor who quotes for a motor without checking the balance of the door is quoting for a repeat visit.
What to ask before you agree to either
- Is the door balanced, and can you show me the door lifting by hand?
- Is this a repair or a replacement, and what is the price of each?
- What model is the new unit, and does the quote name it?
- Will the safety reversal be tested in front of me before you leave?
- What guarantee comes with the repair or the new unit, and what voids it?
- No price is published on this site. Ask the contractor for the call-out fee and the rate before work starts.
04 · Good to know
Frequently asked questions
Can any motor be repaired, or are they disposable?
Most openers are repairable at component level - capacitor, control board, gear, chain, battery. Whether a repair is worth it depends on the age of the unit and the price of the part against the price of a new unit. Ask for both numbers.
My door works from the wall button but not the remote. Is the motor failing?
No. If the door runs from the wall button, the motor is working and the fault is in the remote, its battery, or the receiver. That is the cheapest fault on the list to fix.
How long should a garage door motor last?
Longer than the door's springs, on a balanced door that is serviced. On a heavy or neglected door it can fail in a fraction of that time, which is why the balance check comes first.
Will a bigger motor solve a heavy door?
No. A bigger unit on an unbalanced door works harder, not less, and it also masks the fault that made the door heavy. Fix the springs and balance first.