BoilerFaultCodes FC1 High
Boiler Fault Code FC1
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code FC1 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 heat pump's outdoor sensor that monitors temperature change is not reporting correctly, which prevents the system from managing heat exchange properly. (As reported on Ideal HP290)
Pick your boiler brand for the FC1 fix
Source
Information for the FC1 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