E08 Medium

Ariston E08 Fault Code

The Ariston E08 fault code means: your boiler has lost the connection to the temperature sensor responsible for your underfloor heating, so it has stopped these heaters from working to prevent them from getting too hot.. It appears on 6 Ariston models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Under floor heating temperature probe in open 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 E08 fault code

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

Source

Ariston E08 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 7 July 2026