E12
BFT
Direction Relay or Output Stage Fault
BFT garage door opener shows E12 and the door only moves in one direction or not at all.
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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 motor direction relay on BFT control board, Burned output triac or MOSFET, Short circuit on motor output in one direction, Incorrect wiring of motor leads to control board
How to Fix / Troubleshooting
Safety: Isolate mains power before working on motor wiring or the control board.
- Test both directions: Try open and close commands separately. Note if only one direction fails.
- Inspect motor wiring: Verify that motor leads are correctly connected to the designated terminals and that no wires are swapped or loose.
- Check for shorts: Look for signs of arcing or melted insulation at the motor terminals and along the cable.
- Board inspection: Examine the control board area around the motor relays or output devices for burn marks or cracked components.
- Swap test (advanced): If possible, temporarily connect a known-good motor to the board to confirm whether the fault follows the board or the motor.
In most cases, a failed relay or output device requires replacement of the entire BFT control board.
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Repair Difficulty
Hard
4/5
Required Part
BFT Control Board Motor Output Stage
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