E20
Henderson
Motor Direction or Phase Error
Display shows E20; door moves erratically or in the wrong direction.
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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
Incorrect motor wiring on control board, Reversed limit wiring, Faulty direction relay on PCB, Misconfigured direction setting
How to Fix / Troubleshooting
Safety first: Disconnect power before changing any wiring. Unexpected door movement can cause injury.
Steps:
- Verify wiring: Compare motor and limit switch wiring to the Henderson schematic. Correct any swapped wires, especially up/down limit leads.
- Direction setting: Some models allow reversing motor direction via a jumper or menu setting. Ensure it matches the installation orientation.
- Test operation: After corrections, run the door through a full open and close cycle while observing direction and stopping points.
- If E20 persists: The direction control relay or triac on the Henderson control PCB may be defective. Replace the board.
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Repair Difficulty
Hard
4/5
Required Part
Henderson Control PCB
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