How much does it cost to fix boiler error code 323?

Typical repair cost for the boiler 323 fault is £150-300 including labour.

323 High

Boiler Fault Code 323

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 323 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 failing to communicate correctly with its external controls, preventing your heating or hot water from turning on. (As reported on Worcester Bosch Greenstar 27CDi)

Pick your boiler brand for the 323 fix

Worcester Bosch 323 5 models

Source

Information for the 323 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