BoilerFaultCodes E15 High
Boiler Fault Code E15
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E15 appears across 15 boiler brands and 98 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has shut down because it thinks the water returning from your radiators is hotter than the water leaving the boiler, which suggests a sensor error or a circulation problem. (As reported on Remeha Quinta 115)
Pick your boiler brand for the E15 fix
Alpha E15 23 models Ariston E15 2 models Baxi E15 24 models Biasi E15 5 models Heatline E15 2 models Ideal E15 6 models Johnson Starley E15 9 models Main E15 1 model Navien E15 6 models Potterton E15 4 models Remeha E15 8 models Saunier Duval E15 4 models Viessmann E15 1 model Vokera E15 2 models Warmhaus E15 1 model
Source
Information for the E15 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