How much does it cost to fix boiler error code 0.51?

Typical repair cost for the boiler 0.51 fault is £150-300 including labour.

0.51 High

Boiler Fault Code 0.51

Also written as 051 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 0.51 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 is failing to light the burner because it cannot detect a flame, causing the system to stop working as a safety precaution. (As reported on Johnson Starley Aquair S 10)

Pick your boiler brand for the 0.51 fix

Johnson Starley 0.51 1 model

Source

Information for the 0.51 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