How much does it cost to fix boiler error code CP780?

Typical repair cost for the boiler CP780 fault is £120-250 including labour.

CP780 Medium

Boiler Fault Code CP780

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code CP780 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's internal settings for managing different heating zones are currently confused or misconfigured. (As reported on Baxi 400 Combi 2)

Pick your boiler brand for the CP780 fix

Baxi CP780 1 model

Source

Information for the CP780 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