E8
Henderson
Low Voltage or Power Supply Fault
Opener display shows E8; motor does not run; courtesy light may still work.
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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
Incoming mains voltage too low, Failed internal power supply on control board, Loose line wiring at terminal block, Blown internal fuse on Henderson PCB
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before removing covers. Only qualified persons should test live voltage.
Steps:
- Check mains supply: Verify the circuit breaker is on and not shared with heavy loads. Use a multimeter to confirm correct voltage at the opener input terminals.
- Inspect wiring: With power off, tighten all line and neutral connections at the opener's terminal block. Look for heat discoloration or melted insulation.
- Check internal fuse: Many Henderson boards include a small glass or blade fuse. Remove and test for continuity. Replace only with the same rating if blown, and investigate for shorts before powering up.
- Board power supply: If mains voltage is correct but the board only shows E8 and does not operate the motor, the low‑voltage power supply section of the Henderson control PCB is likely faulty. Replace the board.
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Repair Difficulty
Hard
4/5
Required Part
Henderson Control PCB
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