407 Low

Ariston 407 Fault Code

The Ariston 407 fault code means: your boiler is having trouble communicating with the temperature sensor in your home, which means it cannot accurately determine when to turn the heating on or off.. It appears on 2 Ariston models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Room sensor error
Typical repair cost £120-200 (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 407 fault code

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

Source

Ariston 407 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