How much does it cost to fix boiler error code 205?

Typical repair cost for the boiler 205 fault is £200-400 including labour.

205 High

Boiler Fault Code 205

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code 205 appears across 3 boiler brands and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected an internal communication or hardware failure on its main control board, meaning it has safely shut down to prevent further issues. (As reported on Potterton Promax HE Store)

Pick your boiler brand for the 205 fix

Navien 205 7 models Potterton 205 1 model Worcester Bosch 205 3 models

Source

Information for the 205 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 31 August 2026