E42 Medium

Boiler Fault Code E42

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E42 appears across 8 boiler brands and 26 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning One of the buttons on your boiler's control panel has become stuck or is malfunctioning, preventing you from changing settings. (As reported on Warmhaus Enerwa / Priwa)

Pick your boiler brand for the E42 fix

Alpha E42 5 models Biasi E42 3 models Johnson Starley E42 1 model Potterton E42 1 model Ravenheat E42 9 models Remeha E42 5 models Vokera E42 1 model Warmhaus E42 1 model

Source

Information for the E42 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