Nobel Keypad / User Interface Fault

Softener display works but buttons do not respond or respond intermittently

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Possible Causes

Moisture under keypad, Worn membrane switches, Loose ribbon cable to control board, Contaminated button contacts

How to Fix / Troubleshooting

Safety first: Unplug the unit before opening the control panel.

  • Inspect keypad surface: Check for signs of water ingress or cleaning fluid residue. Dry the surface and avoid spraying cleaners directly on the panel.
  • Check ribbon cable: Remove the cover and reseat the ribbon cable between the keypad/display and the main board.
  • Dry moisture: If condensation is present inside the housing, dry gently with a hair dryer on low heat and improve ventilation around the unit.
  • Test buttons: After reassembly, plug in and test each button. If some remain unresponsive, the keypad assembly may need replacement.
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Repair Difficulty

Easy 2/5

Required Part

Keypad / Display Module
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