Weishaupt User Interface / Keypad Fault

Water heater’s display is on but buttons do not respond or respond intermittently.

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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

Faulty control panel membrane, Moisture ingress behind display, Loose ribbon cable to main board, Control board keypad input failure

How to Fix / Troubleshooting

Safety: Isolate power before removing the front control panel.

  • Dry moisture: If condensation is visible on or behind the display, allow the unit to dry and correct any source of moisture (e.g., bathroom steam, leaks).
  • Check ribbon cable: Carefully remove the front panel and reseat the flat ribbon cable connecting the display/keypad to the main board.
  • Test operation: Restore power and test buttons. If still unresponsive, the front panel assembly may need replacement.
  • Board check: If a new panel does not fix the issue, the main control board keypad input circuit may be defective.
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Repair Difficulty

Medium 3/5

Required Part

Front Control Panel / Display Module
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