Stopped deodorant and nobody started it.
(1) Maintenance of mixing was absent.
(1)-A Person in chang of maintenance turns on and off when mixing.
Other person do not know he always turns on and need to start sytem.
(1)-B Turn on and off can be perated at only 3F.
Except maintenance,nobody knows need to turn on.
(1)-C Man who stopped deodorant system forgot he stopped it.
(2) There was no interlock between deodorant system and mixer.