E44 High

Boiler Fault Code E44

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E44 appears across 9 boiler brands and 37 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 an unusual temperature difference between internal sensors, suggesting a possible circulation issue or a faulty component. (As reported on Ravenheat CSI 120)

Pick your boiler brand for the E44 fix

Alpha E44 5 models Biasi E44 4 models Ferroli E44 1 model Johnson Starley E44 1 model Keston E44 9 models Ravenheat E44 9 models Remeha E44 5 models Vokera E44 2 models Worcester Bosch E44 1 model

Source

Information for the E44 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