164 261 Medium

Ariston 164 261 Fault Code

Also written as 164261 — same fault.

The Ariston 164 261 fault code means: your boiler is signalling a fault with a internal seal which could lead to a water leak or pressure loss inside the unit.. It appears on 1 Ariston model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Gasket 1/4"
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 164 261 fault code

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

Source

Ariston 164 261 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