How much does it cost to fix boiler error code P 3.1?

Typical repair cost for the boiler P 3.1 fault is £120-350 including labour.

P 3.1 Emergency

Boiler Fault Code P 3.1

Also written as P31 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code P 3.1 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 has reached a critically high water pressure that is unsafe for continued operation. (As reported on Potterton Powermax HE)

Pick your boiler brand for the P 3.1 fix

Potterton P 3.1 1 model

Source

Information for the P 3.1 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