Herz User Interface / Keypad Failure

Boiler does not respond to any buttons on the front panel

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 Herz display/keypad module, damaged ribbon cable between UI and PCB, moisture ingress into control panel, locked control panel (child lock)

Safety: Isolate power before removing the front panel.

Check for lock mode: Consult the Herz user manual to see if a child lock or panel lock is active and how to disable it.
Inspect ribbon cable: Remove the front cover and check the flat cable between the display and main PCB for damage or loose connections.
Dry moisture: If condensation is present, allow the panel to dry completely before re-energising.
Replace UI module: If buttons remain unresponsive, replace the Herz display/keypad module.

Medium 3/5

Herz display and keypad module

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