How much does it cost to fix Ariston error code 116?

Typical repair cost for the Ariston 116 fault is £120-250 including labour.

116 Medium

Ariston 116 Fault Code

Q: What does the Ariston 116 fault code mean?

Your boiler has detected that a safety switch associated with your underfloor heating system has tripped or disconnected, causing the system to pause to prevent overheating.

The Ariston 116 fault code means: your boiler has detected that a safety switch associated with your underfloor heating system has tripped or disconnected, causing the system to pause to prevent overheating.. It appears on 2 Ariston models in our database.

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.

Alteas One Repair: £90-180
Clas One Repair: £120-250

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 27 April 2026