How much does it cost to fix boiler error code b6?

Typical repair cost for the boiler b6 fault is £300-500 including labour.

b6 High

Boiler Fault Code b6

Also written as B6 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code b6 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's electronic brain is unable to process information correctly, which means it has stopped working as a safety precaution. (As reported on Worcester Bosch CDi Highflow)

Pick your boiler brand for the b6 fix

Worcester Bosch b6 1 model

Source

Information for the b6 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 7 July 2026