116 Medium

Ariston 116 Fault Code

The Ariston 116 fault code means: your boiler has detected that the external thermostat connected to your underfloor heating system has triggered a safety shut-off or is disconnected, meaning the heating will not run until this is resolved.. It appears on 8 Ariston models 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: floor thermostat contact open
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 116 fault code

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

Source

Ariston 116 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