Viessmann
User Interface Input Failure
Display works but buttons or rotary knob do not respond
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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 keypad or encoder on Viessmann control panel, Moisture ingress into display, Damaged ribbon cable to PCB, Software lock or child lock enabled
How to Fix / Troubleshooting
Safety: Turn off power before removing the control panel.
- Check for lock mode: Consult the user manual to see if a child lock or key lock symbol is displayed. Disable the lock if active.
- Power cycle: Turn off power for a few minutes, then restore to reset the interface.
- Inspect panel: Remove the display module and check for moisture or corrosion. Dry gently if damp.
- Check ribbon cable: Ensure the cable between the display and PCB is fully seated and not damaged.
- Replace UI module: If inputs still do not respond, the user interface module may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Display / User Interface Module
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