BoilerFaultCodesKeston PCB Fault Fault Code
Also written as PCBFAULT — same fault.
The Keston PCB Fault fault code means: your boiler's internal computer brain has malfunctioned or lost its programming, meaning the unit cannot communicate with its components to provide heating or hot water.. It appears on 4 Keston models in our database.
Technical description: If PCB is a spare check Boiler Chip Card (BCC) fitted otherwise replace PCB. Contact installer.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Keston models that show the PCB Fault fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Keston PCB Fault fault code information on this page is sourced and cross-checked against the official Keston service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026