How much does it cost to fix boiler error code P 34?

Typical repair cost for the boiler P 34 fault is £120-220 including labour.

P 34 High

Boiler Fault Code P 34

Also written as P34 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code P 34 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 is struggling to accurately measure the temperature of the water coming into the system, which prevents it from heating your home properly. (As reported on Sime Murelle Revolution 30)

Pick your boiler brand for the P 34 fix

Sime P 34 1 model

Source

Information for the P 34 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