How much does it cost to fix boiler error code F09 – A09?

Typical repair cost for the boiler F09 – A09 fault is £120-300 including labour.

F09 – A09 High

Boiler Fault Code F09 – A09

Also written as F09A09 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code F09 – A09 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has shut down because it has detected it is getting too hot and has locked out for safety. (As reported on Ferroli Domiproject)

Pick your boiler brand for the F09 – A09 fix

Ferroli F09 – A09 3 models

Source

Information for the F09 – A09 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