Vaillant
Keypad / User Interface Fault
Display is on but buttons do not respond or respond intermittently
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Possible Causes
Moisture ingress behind keypad, Worn membrane switches, Loose keypad ribbon cable, Faulty display/keypad module
How to Fix / Troubleshooting
Safety: Disconnect power before removing the front panel.
Steps:
- Dry the panel: If condensation is visible, gently dry the area and improve ventilation around the unit.
- Check ribbon cable: Reseat the keypad/display ribbon cable on the PCB.
- Test buttons: After reassembly, test each button. If some remain unresponsive, the keypad module likely needs replacement.
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Repair Difficulty
Easy
2/5
Required Part
Display and Keypad Module
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