How much does it cost to fix boiler error code E 35?

Typical repair cost for the boiler E 35 fault is £120-220 including labour.

E 35 High

Boiler Fault Code E 35

Also written as E35 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code E 35 appears across 2 boiler brands and 3 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 a faulty connection in the system that monitors the safe exit of exhaust gases, so it has shut down to ensure your home remains safe. (As reported on Chaffoteaux Minima HE System 30)

Pick your boiler brand for the E 35 fix

Chaffoteaux E 35 2 models Vokera E 35 1 model

Source

Information for the E 35 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 31 August 2026