How much does it cost to fix Ariston error code E 13?

Typical repair cost for the Ariston E 13 fault is £120-220 including labour.

E 13 High

Ariston E 13 Fault Code

Q: What does the Ariston E 13 fault code mean?

Your boiler has lost the signal from a temperature sensor that monitors the water returning to the system, meaning the unit cannot safely regulate its heat output.

Also written as E13 — same fault.

The Ariston E 13 fault code means: your boiler has lost the signal from a temperature sensor that monitors the water returning to the system, meaning the unit cannot safely regulate its heat output.. It appears on 2 Ariston models in our database.

Technical description: Return sensor 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 E 13 fault code

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

Source

Ariston E 13 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