BoilerFaultCodesWhat the manual says
Manufacturer manualMain PCB fault
Shared across the 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 experiences an internal electrical failure, preventing it from safely controlling the gas flow and ignition. The most common reason is a component failure on the circuit board itself, though sometimes a faulty gas valve can send an incorrect signal that triggers this specific error.
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 52 fault codes on the Flexicom hx
Seeing a different code? Every code this model can display, in one place.