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 7 July 2026

Fault code 323 appears across 2 boiler brands and 7 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 system is struggling to communicate with its main control unit, which causes the heating and hot water to shut down as a precaution. (As reported on Worcester Bosch Greenstar 12i System)

Pick your boiler brand for the 323 fix

ECA 323 1 model Worcester Bosch 323 6 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 7 July 2026