How much does it cost to fix boiler error code H21-049?

Typical repair cost for the boiler H21-049 fault is £180-300 including labour.

H21-049 High

Boiler Fault Code H21-049

Also written as H21049 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code H21-049 appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's fan is failing to start or maintain the correct speed, which prevents the unit from safely venting exhaust gases and heating your home. (As reported on Ideal Mini HE)

Pick your boiler brand for the H21-049 fix

Ideal H21-049 6 models

Source

Information for the H21-049 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