How much does it cost to fix boiler error code CF?

Typical repair cost for the boiler CF fault is £100-350 including labour.

CF Low

Boiler Fault Code CF

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code CF appears across 2 boiler brands 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 is having trouble 'talking' to its internal Wi-Fi or internet connection module, which may prevent you from controlling it via apps or external thermostats. (As reported on Viessmann Vitodens 222-F)

Pick your boiler brand for the CF fix

Viessmann CF 1 model Worcester Bosch CF 1 model

Source

Information for the CF 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 7 July 2026