How much does it cost to fix boiler error code E31?

Typical repair cost for the boiler E31 fault is £90-180 including labour.

E31 High

Boiler Fault Code E31

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code E31 appears across 3 boiler brands and 8 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

Keston E31 4 models Vokera E31 1 model Warmflow E31 3 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 7 July 2026