Panasonic MDF-DU900V Operating Instructions Manual page 31

ALARM PARAMETERS
● At the alarm state
・While the unit's alarm is being activated and the
buzzer is being sounding, the buzzer is silenced by
pressing Buzzer key. For the behavior at the time
of pressing Buzzer key and the re-activation of
alarm, under each setting condition, refer to Table
4-5 on page 49.
Resolve the cause of the alarm in reference to
page 47 ～ 48 because the alarm itself is not
deactivated by pressing Buzzer key except for
some alarms.
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