BoilerFaultCodesChaffoteaux E 35 Fault Code
Also written as E35 — same fault.
The Chaffoteaux E 35 fault code means: 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.. It appears on 2 Chaffoteaux models in our database.
Technical description: Flue pipe sensor short circuit
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Chaffoteaux models that show the E 35 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Chaffoteaux E 35 fault code information on this page is sourced and cross-checked against the official Chaffoteaux service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026