How much does it cost to fix Ariston error code EE0066?

Typical repair cost for the Ariston EE0066 fault is £120-200 including labour.

EE0066 High

Ariston EE0066 Fault Code

Q: What does the Ariston EE0066 fault code mean?

Your boiler has lost the ability to read the temperature of the water circulating through your radiators, so it has shut down to prevent overheating.

The Ariston EE0066 fault code means: your boiler has lost the ability to read the temperature of the water circulating through your radiators, so it has shut down to prevent overheating.. It appears on 1 Ariston model in our database.

Technical description: Heating flow temperature probe in open circuit

Typical repair cost £120-200 (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 EE0066 fault code

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

Clas One Repair: £120-200

Source

Ariston EE0066 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