Medium
412 on Ariston Alteas One

Your boiler has lost communication with the temperature sensor controlling your second heating zone, meaning it can no longer regulate the heat for those specific rooms.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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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

Room sensor circuit open or short circuit zone 2

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

411View →407View →

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