How much does it cost to fix boiler error code P31?

Typical repair cost for the boiler P31 fault is £150-250 including labour.

P31 Medium

Boiler Fault Code P31

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code P31 appears across 1 boiler brand 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's control panel or display screen is experiencing a communication error, meaning the main brain of the unit cannot talk to the interface you use to change settings. (As reported on Alpha Pro Tec Plus)

Pick your boiler brand for the P31 fix

Alpha P31 2 models

Source

Information for the P31 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