Furnace displays E19 and becomes unresponsive to user inputs.

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, Damaged keypad membrane, Loose ribbon cable between UI and main PCB, Software lock-up

Safety: Isolate power before removing the front panel or control fascia.

User checks:

Turn off power at the fused spur for 2 minutes, then restore power and see if the display recovers.

Technician checks:

Inspect the ribbon cable and connectors between the user interface and main PCB.
Check for signs of moisture ingress behind the control panel.
Test button functions and display outputs; replace the UI board if faulty.
If UI is good, suspect main PCB firmware or hardware fault.

Medium 3/5

User Interface PCB

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