ABB Niessen N9611-21 Installation And Use Manual page 18

IN CASE OF ALARM, THE FOLLOWING ACTIONS SHOULD BE TAKEN:
Close the gas supply
4.2. Deactivation of the alarm and normal situation
restoration
Warning: Before deactivating the alarm and rearming the system, the
cause of the problem should be eliminated, or block the general gas way
by the manual closing of the stopcock, since in the moment the alarm
is deactivated the electric valve opens and there is again gas in the house.
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18
GB