E20 High

Boiler Fault Code E20

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E20 appears across 9 boiler brands and 94 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 a fault with the internal sensor that monitors the temperature of your central heating water, causing the system to stop working as a safety precaution. (As reported on Main Eco Compact)

Pick your boiler brand for the E20 fix

Alpha E20 21 models Ariston E20 6 models Baxi E20 37 models Biasi E20 4 models Main E20 5 models Potterton E20 15 models Remeha E20 1 model Saunier Duval E20 4 models Vokera E20 1 model

Source

Information for the E20 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