How much does it cost to fix Ariston error code 711?

Typical repair cost for the Ariston 711 fault is £90-160 including labour.

711 High

Ariston 711 Fault Code

Q: What does the Ariston 711 fault code mean?

Your boiler has lost track of the temperature of the water coming back from your radiators, which may stop your heating from working efficiently or starting up at all.

The Ariston 711 fault code means: your boiler has lost track of the temperature of the water coming back from your radiators, which may stop your heating from working efficiently or starting up at all.. It appears on 1 Ariston model in our database.

Technical description: Return sensor defective (zone 1)

Typical repair cost £90-160 (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 711 fault code

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

Alteas One Repair: £90-160

Source

Ariston 711 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