E017
John Wood
Internal Self-Test Failure
John Wood electronic gas water heater displays E017 and the burner will not light; code appears immediately on startup
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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
Corrupted control firmware, Internal sensor reference failure, Control board hardware defect
How to Fix / Troubleshooting
Safety: Turn off power before handling the control module.
- 1. Hard reset: Disconnect power for at least 10 minutes to fully discharge the control. Restore power and see if E017 clears.
- 2. Check grounding: Ensure the heater and control are properly grounded. Loose ground connections can cause self-test errors.
- 3. Inspect board: Look for obvious damage such as burn marks or corrosion. If present, replace the board.
- 4. Replace control module: If E017 persists with no visible damage and wiring is correct, replace the main control board with an OEM John Wood part.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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