How much does it cost to fix Ariston error code EE 0066?

Typical repair cost for the Ariston EE 0066 fault is £120-180 including labour.

EE 0066 High

Ariston EE 0066 Fault Code

Q: What does the Ariston EE 0066 fault code mean?

Your boiler has lost the signal from the sensor that monitors the water temperature, causing it to stop heating your home to prevent potential overheating.

Also written as EE0066 — same fault.

The Ariston EE 0066 fault code means: your boiler has lost the signal from the sensor that monitors the water temperature, causing it to stop heating your home to prevent potential overheating.. It appears on 4 Ariston models in our database.

Technical description: Heating flow temperature probe in open circuit

Typical repair cost £120-180 (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 EE 0066 fault code

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

Source

Ariston EE 0066 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