How much does it cost to fix boiler error code PP4?

Typical repair cost for the boiler PP4 fault is £120-190 including labour.

PP4 High

Boiler Fault Code PP4

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code PP4 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 has stopped working because one of its internal sensors is failing to monitor the temperature of the water returning to the unit. (As reported on Grant Vortex)

Pick your boiler brand for the PP4 fix

Grant PP4 2 models

Source

Information for the PP4 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