E35 Emergency

Ariston E35 Fault Code

The Ariston E35 fault code means: your boiler has detected that a safety sensor meant to monitor the exhaust gases is not reading correctly, so it has shut down to keep your home safe.. It appears on 2 Ariston models 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 £120-220 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ariston models that show the E35 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ariston E35 fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026