BFT Motor Start Capacitor Failure (AC Motor Models)

Garage door opener hums but door does not move; BFT motor makes a buzzing sound for a few seconds then stops.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Failed start capacitor in BFT operator head, Aged capacitor with reduced capacitance, Loose capacitor terminals, Overloaded motor due to stiff door

How to Fix / Troubleshooting

Safety: Disconnect mains power and discharge the capacitor before touching it. Capacitors can store dangerous energy.

  • Locate capacitor: Open the BFT operator housing and find the cylindrical or oval capacitor connected to the motor wires.
  • Inspect visually: Look for bulging, leaking, or cracked casing. Any visible damage means the capacitor must be replaced.
  • Check connections: Ensure the spade terminals are tight and not corroded.
  • Test capacitance: Use a capacitance meter to measure the value and compare with the rating printed on the capacitor (e.g., 8 µF, 12 µF). Replace if out of tolerance.
  • Replace with correct part: Install a new capacitor of the same µF rating and equal or higher voltage rating, approved for use with BFT motors.
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Repair Difficulty

Medium 3/5

Required Part

Motor Start Capacitor
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