How much does it cost to fix boiler error code C551A?

Typical repair cost for the boiler C551A fault is £150-250 including labour.

C551A Emergency

Boiler Fault Code C551A

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code C551A 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 has detected an issue with the sensor that confirms the burner flame is lit, causing it to shut down for safety reasons. (As reported on Myson Wallflame WF IV)

Pick your boiler brand for the C551A fix

Myson C551A 1 model

Source

Information for the C551A 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