Boiler displays A23, no response to user interface, buttons not working

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

Failed display PCB, damaged keypad, communication fault with main PCB, moisture ingress

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

Power reset: Turn off power for a few minutes and restore. Sometimes the interface recovers.
Inspect display board: Remove the front cover and check the display PCB for signs of burning, corrosion, or water damage.
Check ribbon cable: Ensure the ribbon or plug between display and main PCB is firmly seated.
Technician tasks: Replace the display board or main PCB if communication cannot be restored.

Hard 4/5

Display / User Interface PCB

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