How much does it cost to fix boiler error code b2?

Typical repair cost for the boiler b2 fault is £300-500 including labour.

b2 High

Boiler Fault Code b2

Also written as B2 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code b2 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 computer is having trouble reading its internal instructions, which means it cannot safely operate the heating or hot water. (As reported on Worcester Bosch CDi Highflow)

Pick your boiler brand for the b2 fix

Worcester Bosch b2 1 model

Source

Information for the b2 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