How much does it cost to fix boiler error code Keys fault?

Typical repair cost for the boiler Keys fault fault is £120-350 including labour.

Keys fault High

Boiler Fault Code Keys fault

Also written as KEYSFAULT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Keys fault 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's internal computer has detected a problem with its settings or the identification key that tells it how to operate. (As reported on Biasi Antares System)

Pick your boiler brand for the Keys fault fix

Biasi Keys fault 1 model

Source

Information for the Keys fault 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