Medium
164 282 on Ariston Excalibur

Your boiler has detected a minor internal seal leak, which likely needs to be addressed to prevent water damage or further system failure.

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.

What the manual says

Manufacturer manual

Gasket 3/8"

Shared across the Excalibur range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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All 21 fault codes on the Excalibur

Seeing a different code? Every code this model can display, in one place.

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