How much does it cost to fix Ariston error code floor thermostat contact open?

Typical repair cost for the Ariston floor thermostat contact open fault is £120-250 including labour.

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Ariston floor thermostat contact open Fault Code

Q: What does the Ariston floor thermostat contact open fault code mean?

Your boiler has automatically shut down because the water inside the system has become dangerously hot.

Also written as FLOORTHERMOSTATCONTACTOPEN — same fault.

The Ariston floor thermostat contact open fault code means: your boiler has automatically shut down because the water inside the system has become dangerously hot.. It appears on 1 Ariston model in our database.

Technical description: If the outlet temperature is too high, the boiler will stop both domestic hot water and the heating production. Flashing light (Green Leds Temperature indicador 40 and 70) will restart when the thermostat is closed during automatic resetting.

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 floor thermostat contact open fault code

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

Clas One Repair: £120-250

Source

Ariston floor thermostat contact open 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