How much does it cost to fix boiler error code 256?

Typical repair cost for the boiler 256 fault is £150-350 including labour.

256 High

Boiler Fault Code 256

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 256 appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's internal computer is experiencing a temporary communication error or software glitch that is preventing it from running properly. (As reported on Worcester Bosch Greenstar 8000 Style)

Pick your boiler brand for the 256 fix

Worcester Bosch 256 5 models

Source

Information for the 256 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