Medium
7 22 on Ariston Clas ONE System

Your boiler has detected that the temperature in your secondary heating zone, such as an upstairs floor or an extension, is getting too hot and has shut down as a safety precaution.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

Zone 2 overheating

From this model's manual
Verified against the Ariston/Ariston Clas Net One installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Check that all radiator valves in Zone 2 are turned fully open.Ensure there are no obstructions like furniture blocking airflow to these radiators.Restart the boiler using the Reset button to see if the fault clears.

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Related fault codes

702View →712View →723View →

All 46 fault codes on the Clas ONE System

Seeing a different code? Every code this model can display, in one place.

1 011 031 041 051 061 071 081 091 101 121 141 161 181 P11 P21 P31 P42 053 013 023 033 043 053 063 073 P94 114 124 135 015 025 045 P15 P25 P36 106 127 017 027 037 117 127 137 237 50

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