E31 High

Boiler Fault Code E31

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E31 appears across 13 boiler brands and 86 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has lost communication with the internal sensor that monitors the temperature of the water leaving the unit, usually due to a loose wire or a faulty part. (As reported on Keston C36)

Pick your boiler brand for the E31 fix

Alpha E31 29 models Baxi E31 1 model Biasi E31 2 models Ferroli E31 3 models Halstead E31 6 models Intergas E31 6 models Johnson Starley E31 2 models Keston E31 9 models Navien E31 6 models Potterton E31 3 models Ravenheat E31 9 models Remeha E31 8 models Vokera E31 2 models

Source

Information for the E31 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