Medium
7 03 on Ariston Clas System 28

Your boiler is having trouble communicating with the temperature sensor for one of your heating zones, which may cause that specific part of your home to be colder than expected.

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

Zone3 Send Probe Damaged

Engineer required

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

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Related fault codes

7 01View →7 02View →7 04View →

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