Sime
User Interface Control Failure
Water heater display works but buttons or knobs do not respond to input.
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Possible Causes
Faulty keypad or encoder, Moisture ingress into control panel, Loose ribbon cable, Failed user interface PCB
How to Fix / Troubleshooting
Safety: Turn off power before removing the front panel.
Steps:
- Dry panel: If the panel is damp (e.g., from bathroom steam), allow it to dry completely and avoid direct water splashes.
- Check cable: Reseat the ribbon or plug cable between the user interface and main PCB.
- Test again: Restore power and test button response.
Professional help: If controls remain unresponsive, the user interface PCB may need replacement.
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Repair Difficulty
Easy
2/5
Required Part
User Interface PCB / Keypad
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