164 225 Emergency

Ariston 164 225 Fault Code

Also written as 164225 — same fault.

The Ariston 164 225 fault code means: your boiler has detected a physical seal failure, which means gas or fumes could leak out, so you should turn it off immediately and stop using it.. It appears on 1 Ariston model in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Gasket 3/4"
Typical repair cost £120-250 (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 164 225 fault code

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

Source

Ariston 164 225 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 7 July 2026