Suddenly last night all of our smoke detector started going off. They went off for about 30 seconds then stopped. They have been going off periodically at different times all night long. We don't see any problem of fire or smoke anywhere. Some of them are hardwired some of them need batteries. What is going on

Asked by Ann Evans on 01/06/2014 1  Answer

ManualsOnline posted an answer 10 years, 10 months ago

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