BoilerFaultCodes E01 High
Boiler Fault Code E01
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E01 appears across 19 boiler brands and 149 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your heat pump has stopped working because the internal safety system has detected a communication error or a power supply issue. (As reported on Ideal HP290)
Pick your boiler brand for the E01 fix
Alpha E01 30 models Atag E01 3 models Baxi E01 9 models Biasi E01 12 models Ferroli E01 10 models Grant E01 2 models Halstead E01 6 models Heatline E01 7 models Ideal E01 7 models Intergas E01 6 models Johnson Starley E01 12 models Keston E01 9 models Navien E01 5 models Potterton E01 7 models Remeha E01 8 models Saunier Duval E01 6 models Viessmann E01 1 model Vokera E01 6 models Worcester Bosch E01 3 models
Source
Information for the E01 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