E43 High

Boiler Fault Code E43

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E43 appears across 8 boiler brands and 49 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped working because it cannot get a temperature reading from the main pipe where hot water leaves the unit. (As reported on Vokera Condexa Pro)

Pick your boiler brand for the E43 fix

Alpha E43 22 models Johnson Starley E43 1 model Keston E43 9 models Potterton E43 1 model Ravenheat E43 9 models Remeha E43 5 models Vokera E43 1 model Warmhaus E43 1 model

Source

Information for the E43 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