How much does it cost to fix Ariston error code 414?

Typical repair cost for the Ariston 414 fault is £90-180 including labour.

414 Medium

Ariston 414 Fault Code

Q: What does the Ariston 414 fault code mean?

Your boiler has lost communication with the temperature sensor responsible for the third heating zone in your home, meaning that specific area may not heat correctly.

The Ariston 414 fault code means: your boiler has lost communication with the temperature sensor responsible for the third heating zone in your home, meaning that specific area may not heat correctly.. It appears on 4 Ariston models in our database.

Technical description: Room sensor circuit open or short circuit zone 3

What causes the Ariston 414 fault?

This fault occurs when the boiler loses its electrical connection to the thermostat or sensor that controls your third heating zone. The most common reason is a loose or damaged wire between the boiler and the sensor, or a technical failure within the sensor unit itself.

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 414 fault code

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

Source

Ariston 414 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