BoilerFaultCodesTechnical description
Printed circuit board (PCB) error – try resetting the boiler
What causes this fault?
This fault occurs when the boiler's main control board experiences a communication failure or a data processing error within its internal memory. It is often caused by a sudden electrical surge, loose wiring connections, or the natural degradation of the electronic components on the circuit board over time.
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.
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