BoilerFaultCodes E04 High
Boiler Fault Code E04
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E04 appears across 19 boiler brands and 114 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is repeatedly starting up and then losing its flame, causing the heating and hot water to become unreliable. (As reported on Potterton Gold Combi HE)
Pick your boiler brand for the E04 fix
Alpha E04 13 models Ariston E04 8 models Atag E04 3 models Baxi E04 2 models Biasi E04 12 models Ferroli E04 10 models Halstead E04 6 models Heatline E04 4 models Intergas E04 6 models Johnson Starley E04 5 models Keston E04 9 models Main E04 1 model Navien E04 6 models Potterton E04 4 models Ravenheat E04 9 models Remeha E04 8 models Viessmann E04 1 model Vokera E04 6 models Warmhaus E04 1 model
Source
Information for the E04 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