E009
John Wood
User Interface / Keypad Failure
John Wood electronic gas water heater shows E009 and does not respond to temperature adjustments
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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 display/keypad module, Damaged ribbon cable between UI and main board, Moisture intrusion into control panel
How to Fix / Troubleshooting
Safety: Disconnect power before removing the front control panel.
- 1. Inspect for moisture: Look for signs of water leaks above the control panel. Fix any plumbing leaks before replacing electronics.
- 2. Check ribbon cable: Remove the display/keypad assembly and inspect the ribbon cable for kinks, corrosion, or broken traces. Reseat both ends firmly.
- 3. Test buttons: With power restored, try each button. If none respond and wiring is intact, the UI module is likely defective.
- 4. Replace UI module: Order the correct John Wood display/keypad assembly for your model. Transfer any mounting hardware and gasket to ensure a proper seal against moisture.
- 5. Verify operation: After replacement, reprogram temperature and confirm that error E009 is cleared and controls respond normally.
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Repair Difficulty
Medium
3/5
Required Part
Display/Keypad Assembly
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