How much does it cost to fix boiler error code B08?

Typical repair cost for the boiler B08 fault is £120-250 including labour.

B08 Medium

Boiler Fault Code B08

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code B08 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 is having trouble communicating with its internal timer, which means your scheduled heating programs may not turn on or off as expected. (As reported on Ariston E-Combi One 30)

Pick your boiler brand for the B08 fix

Ariston B08 6 models

Source

Information for the B08 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