BoilerFaultCodesWhat the manual says
Manufacturer manualInternal fault (PCB)
Shared across the Pinnacle range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
What causes this fault?
This fault occurs when the boiler's central brain, the printed circuit board, suffers an internal memory or communication failure. It is typically caused by electrical components wearing out over time or damage from a sudden power surge in the home’s electrical supply.
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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Related fault codes
All 50 fault codes on the Pinnacle
Seeing a different code? Every code this model can display, in one place.