How much does it cost to fix boiler error code CFL40?

Typical repair cost for the boiler CFL40 fault is £120-250 including labour.

CFL40 High

Boiler Fault Code CFL40

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code CFL40 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 boiler has stopped working because it cannot sense that the pilot light has successfully ignited or is staying lit. (As reported on Potterton Kingfisher MF RSL/CFL)

Pick your boiler brand for the CFL40 fix

Potterton CFL40 1 model

Source

Information for the CFL40 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