2A High

Boiler Fault Code 2A

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 2A appears across 2 boiler brands and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped working because an internal safety fuse has blown, cutting off the power to its main control systems. (As reported on Main Combi 24)

Pick your boiler brand for the 2A fix

Chaffoteaux 2A 2 models Main 2A 1 model

Source

Information for the 2A 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 31 August 2026