How much does it cost to fix boiler error code E42?

Typical repair cost for the boiler E42 fault is £90-220 including labour.

E42 Medium

Boiler Fault Code E42

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code E42 appears across 4 boiler brands and 5 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)

Pick your boiler brand for the E42 fix

Biasi E42 1 model Potterton E42 2 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 7 July 2026