Saunier Duval User interface / control panel fault.

Water heater display works, but buttons or knobs do not respond.

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.

Possible Causes

Faulty keypad or encoder, loose ribbon cable between UI and PCB, moisture ingress into control panel, damaged display board.

Safety first: Turn off power before removing the front panel or control fascia.

Steps:

Check lock function: Some Saunier Duval models have a child lock or panel lock. Refer to the manual to disable it.
Inspect ribbon cable: Reseat the flat cable between the display board and main PCB.
Dry moisture: If condensation is present, allow the panel to dry completely and improve room ventilation.
Replace UI board: If buttons remain unresponsive, the user interface board may need replacement.

Warning: Do not spray cleaning liquids directly onto the control panel. This can cause failures.

Medium 3/5

User Interface PCB.

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