How much does it cost to fix boiler error code P 0.9?

Typical repair cost for the boiler P 0.9 fault is £0-80 including labour.

P 0.9 Low

Boiler Fault Code P 0.9

Also written as P09 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code P 0.9 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 noticed that the water pressure is getting a bit low and needs a small top-up to keep running efficiently. (As reported on Potterton Powermax HE)

Pick your boiler brand for the P 0.9 fix

Potterton P 0.9 1 model

Source

Information for the P 0.9 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