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

Typical repair cost for the boiler CFS fault is £150-250 including labour.

CFS High

Boiler Fault Code CFS

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code CFS appears across 1 boiler brand and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to detect the correct temperature difference between the water leaving and returning to the system, causing it to stop heating as a safety precaution. (As reported on Vokera Vibe Max)

Pick your boiler brand for the CFS fix

Vokera CFS 7 models

Source

Information for the CFS 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