How much does it cost to fix Ariston error code 412?

Typical repair cost for the Ariston 412 fault is £90-180 including labour.

412 Medium

Ariston 412 Fault Code

Q: What does the Ariston 412 fault code mean?

Your boiler has lost communication with the temperature sensor controlling your second heating zone, meaning it can no longer regulate the heat for those specific rooms.

The Ariston 412 fault code means: your boiler has lost communication with the temperature sensor controlling your second heating zone, meaning it can no longer regulate the heat for those specific rooms.. It appears on 1 Ariston model in our database.

Technical description: Room sensor circuit open or short circuit zone 2

Typical repair cost £90-180 (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 412 fault code

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

Alteas One Repair: £90-180

Source

Ariston 412 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