How much does it cost to fix boiler error code Fault?

Typical repair cost for the boiler Fault fault is £150-350 including labour.

Fault High

Boiler Fault Code Fault

Also written as FAULT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Fault appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to burn the gas cleanly, which is causing an internal vibration or rumbling noise that requires professional attention. (As reported on Worcester Bosch Greenstar 25HE)

Pick your boiler brand for the Fault fix

Worcester Bosch Fault 2 models

Source

Information for the Fault fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026