E 35 Emergency

Chaffoteaux E 35 Fault Code

Also written as E35 — same fault.

The Chaffoteaux E 35 fault code means: your boiler has detected an issue with the sensor that monitors the exhaust system, meaning it has safely shut down to prevent any risk of fumes entering your home.. It appears on 1 Chaffoteaux model in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Flue pipe sensor short circuit
Typical repair cost £120-250 (including labour)

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 27 April 2026