How much does it cost to fix boiler error code 2.31?

Typical repair cost for the boiler 2.31 fault is £150-300 including labour.

2.31 High

Boiler Fault Code 2.31

Also written as 231 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code 2.31 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 an issue with the air pressure or airflow within the system, meaning it has safely shut itself down to prevent unsafe operation. (As reported on Johnson Starley Aquair S 10)

Pick your boiler brand for the 2.31 fix

Johnson Starley 2.31 1 model

Source

Information for the 2.31 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