How much does it cost to fix boiler error code Fan runs at max. speed?

Typical repair cost for the boiler Fan runs at max. speed fault is £150-300 including labour.

Fan runs at max. speed High

Boiler Fault Code Fan runs at max. speed

Also written as FANRUNSATMAXSPEED — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Fan runs at max. speed appears across 1 boiler brand and 2 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 running continuously at full speed, which indicates the system has detected a safety concern and is trying to clear the air inside the unit. (As reported on Alpha CB 240 / 280)

Pick your boiler brand for the Fan runs at max. speed fix

Alpha Fan runs at max. speed 2 models

Source

Information for the Fan runs at max. speed 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