How much does it cost to fix boiler error code 3P9?

Typical repair cost for the boiler 3P9 fault is £80-£120 including labour.

3P9 Low

Boiler Fault Code 3P9

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 3P9 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 detected that it is time for a scheduled routine maintenance service to ensure it continues running safely and efficiently. (As reported on Ariston Alteas One)

Pick your boiler brand for the 3P9 fix

Ariston 3P9 1 model

Source

Information for the 3P9 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