Safety: Turn off power before removing the front panel or display module.

Inspect the keypad: Check for physical damage or contamination around the buttons. Gently clean the surface.
Check the connections: Remove the display panel and verify that the ribbon cable or connector to the main board is fully seated.
Dry moisture: If condensation or water is present, dry the area thoroughly and correct any source of leaks.
Replace the display module: If the interface remains unresponsive, replace the display/control panel with a compatible Buderus part.
Test operation: Restore power and verify that buttons respond and settings can be changed.

The water heater display is on but unresponsive to button presses.

Possible Causes