How much does it cost to fix Ariston error code 4 07?

Typical repair cost for the Ariston 4 07 fault is £120-220 including labour.

4 07 Medium

Ariston 4 07 Fault Code

Q: What does the Ariston 4 07 fault code mean?

Your boiler is struggling to read the temperature because the connection to your thermostat or the internal room sensor is faulty or disconnected.

Also written as 407 — same fault.

The Ariston 4 07 fault code means: your boiler is struggling to read the temperature because the connection to your thermostat or the internal room sensor is faulty or disconnected.. It appears on 9 Ariston models in our database.

Technical description: Room sensor circuit open/short 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 4 07 fault code

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

Source

Ariston 4 07 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