CF05 Low

Boiler Fault Code CF05

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code CF05 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 heating system is currently trying to establish a link between the heat pump and its control unit. (As reported on Ideal Halo Air RF WI FI 2 Zone)

Pick your boiler brand for the CF05 fix

Ideal CF05 1 model

Source

Information for the CF05 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