How much does it cost to fix Ariston error code E08?

Typical repair cost for the Ariston E08 fault is £120-250 including labour.

E08 High

Ariston E08 Fault Code

Q: What does the Ariston E08 fault code mean?

Your boiler has switched off because a safety sensor in your underfloor heating system has detected the water is getting too hot and has triggered an automatic shutdown to prevent damage.

The Ariston E08 fault code means: your boiler has switched off because a safety sensor in your underfloor heating system has detected the water is getting too hot and has triggered an automatic shutdown to prevent damage.. It appears on 10 Ariston models in our database.

Technical description: Under floor heating system safety thermostat contact open (boiler shutdown both in D.H.W. mode and C.H. mode; boiler operation resumes automatically when the thermostat contact closes on cooling).

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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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 27 April 2026