How much does it cost to fix Ariston error code 3 - OVERHEATING?

Typical repair cost for the Ariston 3 - OVERHEATING fault is £150-300 including labour.

3 - OVERHEATING Emergency

Ariston 3 - OVERHEATING Fault Code

Q: What does the Ariston 3 - OVERHEATING fault code mean?

Your boiler has automatically turned itself off because the water inside it has become dangerously hot.

Also written as 3OVERHEATING — same fault.

The Ariston 3 - OVERHEATING fault code means: your boiler has automatically turned itself off because the water inside it has become dangerously hot.. It appears on 3 Ariston models in our database.

Technical description: This control shuts off the boiler in the case where the primary circuit reaches a temperature in excess of 105°C. The red L.E.D.s “I” and “F” will illuminate to signal this shutdown status.

Typical repair cost £150-300 (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 3 - OVERHEATING fault code

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

Source

Ariston 3 - OVERHEATING 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