Defro User Interface Panel Failure

Boiler display is on but completely unresponsive to button presses or knob adjustments.

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 Defro control panel (HMI), Stuck or damaged buttons, Communication fault between HMI and PCB, Moisture ingress into front panel

Safety: Isolate power before removing the front panel.

Power cycle: Turn off power for 2 minutes, then restore. Sometimes the interface will recover from a temporary lockup.
Inspect panel: Remove the front cover and check the Defro display panel for signs of water damage or corrosion.
Check ribbon cable: Ensure the ribbon or connector between the panel and PCB is firmly seated.
Panel replacement: If the display lights but remains unresponsive, the HMI module likely needs replacement with a compatible Defro control panel.

Medium 3/5

Defro user interface panel

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