How much does it cost to fix boiler error code B05?

Typical repair cost for the boiler B05 fault is £90-160 including labour.

B05 High

Boiler Fault Code B05

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code B05 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 a problem with the sensor that monitors the temperature of the water being sent to your radiators, which prevents it from heating your home safely. (As reported on Ariston Eurocombi A/23 MFFI)

Pick your boiler brand for the B05 fix

Ariston B05 1 model

Source

Information for the B05 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