How much does it cost to fix Ariston error code 40 ❍, 50 ❍, 60 ❍, yellow ❍?

Typical repair cost for the Ariston 40 ❍, 50 ❍, 60 ❍, yellow ❍ fault is £120-220 including labour.

40 ❍, 50 ❍, 60 ❍, yellow ❍ Medium

Ariston 40 ❍, 50 ❍, 60 ❍, yellow ❍ Fault Code

Q: What does the Ariston 40 ❍, 50 ❍, 60 ❍, yellow ❍ fault code mean?

Your boiler has lost communication with its temperature sensor, meaning it cannot accurately tell how warm your room is and may stop heating your home as a safety precaution.

Also written as 405060YELLOW — same fault.

The Ariston 40 ❍, 50 ❍, 60 ❍, yellow ❍ fault code means: your boiler has lost communication with its temperature sensor, meaning it cannot accurately tell how warm your room is and may stop heating your home as a safety precaution.. It appears on 1 Ariston model in our database.

Technical description: Room sensor circuit open / short circuit

Typical repair cost £120-220 (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 40 ❍, 50 ❍, 60 ❍, yellow ❍ fault code

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

Clas One Repair: £120-220

Source

Ariston 40 ❍, 50 ❍, 60 ❍, 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