312 Low

Boiler Fault Code 312

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 312 appears across 3 boiler brands and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is currently running a programmed safety cycle to remove air bubbles from the system, which is a normal process and will stop automatically in about 7 minutes. (As reported on Baxi 624 Combi)

Pick your boiler brand for the 312 fix

Baxi 312 2 models Main 312 1 model Worcester Bosch 312 4 models

Source

Information for the 312 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