BoilerFaultCodes E01 High
Boiler Fault Code E01
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E01 appears across 15 boiler brands and 48 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 2 models Ariston E01 3 models Baxi E01 4 models Biasi E01 9 models ECA E01 3 models Halstead E01 1 model Ideal E01 5 models Johnson Starley E01 4 models Keston E01 3 models Main E01 2 models Potterton E01 1 model Ravenheat E01 2 models Remeha E01 3 models Warmflow E01 3 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 31 August 2026