How much does it cost to fix boiler error code P3?

Typical repair cost for the boiler P3 fault is £90-180 including labour.

P3 High

Boiler Fault Code P3

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code P3 appears across 3 boiler brands and 15 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 electrical circuit has lost power because a small safety fuse has blown, preventing the system from starting up. (As reported on Worcester Bosch Greenstar 25 HE Combi)

Pick your boiler brand for the P3 fix

Ideal P3 1 model Vaillant P3 1 model Worcester Bosch P3 13 models

Source

Information for the P3 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 27 April 2026