What the manual says
Manufacturer manualReplace PCB.
What causes this fault?
This fault occurs when the boiler's central control board suffers a hardware failure, often due to an electrical surge or moisture ingress. Over time, heat stress or liquid from a small internal leak can damage the delicate circuitry, leading to a total communication failure between the components.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Avoid the next call-out bill
A cover plan would handle faults like PCB FAULT: no call-out fees, no surprise bills.
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