How much does it cost to fix Ariston error code 80 ❍, yellow ❍?

Typical repair cost for the Ariston 80 ❍, yellow ❍ fault is £120-250 including labour.

80 ❍, yellow ❍ Medium

Ariston 80 ❍, yellow ❍ Fault Code

Q: What does the Ariston 80 ❍, yellow ❍ fault code mean?

Your boiler has stopped heating because a secondary control, typically a floor thermostat or a safety cut-out for underfloor heating, is telling the system to power down.

Also written as 80YELLOW — same fault.

The Ariston 80 ❍, yellow ❍ fault code means: your boiler has stopped heating because a secondary control, typically a floor thermostat or a safety cut-out for underfloor heating, is telling the system to power down.. It appears on 1 Ariston model 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 80 ❍, yellow ❍ fault code

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

Clas One Repair: £120-250

Source

Ariston 80 ❍, yellow ❍ 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