It is said that a building has several exempt false alarms, after which there will be fines. So if your building has not run out of teh quota you will not be fined.
Don't know whether this is right though 'cause I jsut heard people say it.
In any event I once caused the alarm and the firemen came. I asked them whether there was a fine and they said no.
我有类似的经历,没有被罚款:我居住的单元有一天报警器大叫,我们家又没有人在家。我的居心不良的房东竟把消防队叫了来,一共两辆大车,破门而入。当我回来时门窗都大开,消防队还没有撤走,一个可能是Leader的跟我解释为什么破门进来的原因。我表示认可。记得我当时就说了一句话:I know the alarm is disorder. 说了一些注意事项,消防队就走了。