How much does it cost to fix boiler error code CP230?

Typical repair cost for the boiler CP230 fault is £100-200 including labour.

CP230 Low

Boiler Fault Code CP230

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code CP230 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 is struggling to automatically adjust its temperature based on the outdoor weather because the external sensor signal is not being read correctly. (As reported on Baxi 400 Combi 2)

Pick your boiler brand for the CP230 fix

Baxi CP230 1 model

Source

Information for the CP230 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