Garage door opener hums but does not move the door on Overhead Door AC motor model

Safety first: Unplug the opener and discharge the capacitor before handling. Capacitors can store dangerous charge.

• 1. Access the capacitor: Remove the opener cover. Locate the cylindrical capacitor mounted near the motor.
• 2. Inspect visually: Look for bulging ends, leaking fluid, or burn marks. Any of these signs indicate failure.
• 3. Check connections: Ensure the capacitor leads are firmly attached to the correct terminals.
• 4. Replace capacitor: Obtain an Overhead Door-compatible capacitor with the same microfarad (µF) rating and voltage. Swap the old capacitor for the new one, matching wire positions.
• 5. Verify door balance: Confirm the door moves easily by hand to reduce starting load on the motor.
• 6. Restore power and test: Plug in the opener and test operation. If the motor still only hums, the motor windings or gear train may be damaged and require professional replacement.