Biasi PCB Communication / Internal Fault

Boiler displays error 15; this may indicate a communication error between the display and the main PCB or an internal electronics fault.

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 board, Loose ribbon cable between boards, Main PCB failure, Moisture ingress on electronics.

Safety: Isolate electrical power before opening the control panel.

Power reset: Turn off the boiler at the isolator for 5 minutes, then restore power to see if the error clears.
Inspect connections: Open the control panel and check the ribbon cable and connectors between the user interface and main PCB. Reseat them carefully.
Check for moisture: Look for signs of water ingress from above (e.g., from a leaking flue or pipe). Any moisture on the PCB must be dried and the source of the leak repaired.
Engineer replacement: If the error persists, a technician may need to replace the display board or main PCB and reconfigure parameters according to Biasi specifications.

Professional Required 5/5

Control PCB Assembly

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