How much does it cost to fix boiler error code b 24?

Typical repair cost for the boiler b 24 fault is £150-300 including labour.

b 24 High

Boiler Fault Code b 24

Also written as B24 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code b 24 appears across 3 boiler brands and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is confused because the water leaving it is cooler than the water returning, suggesting a flow problem or a faulty sensor reading. (As reported on Vokera Hydra)

Pick your boiler brand for the b 24 fix

Ideal b 24 1 model Keston b 24 3 models Vokera b 24 1 model

Source

Information for the b 24 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