BoilerFaultCodes E031 High
Boiler Fault Code E031
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E031 appears across 1 boiler brand and 6 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 parts of its internal heating system have reached a temperature that is too high, so it has safely shut itself down as a precaution. (As reported on Navien LCB700)
Pick your boiler brand for the E031 fix
Source
Information for the E031 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