ACV User Interface / Display Board Failure

Boiler display is blank or intermittent, but power supply is present

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 display PCB, Loose low-voltage connector, Moisture ingress, Main PCB low-voltage supply fault

Safety first: Isolate power before removing the front panel.

Check external power: Verify the boiler's fused spur or isolator is ON and the fuse is intact.
Power cycle: Turn off and on to see if the display returns.
Visual inspection: A competent person can check the ribbon cable or harness between the main PCB and the display for secure connection and signs of moisture.
Professional repair: A technician may need to replace the display board or main PCB and reconfigure the boiler.

Hard 4/5

Display / User Interface PCB

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