Post here if you need help with something related to fire alarms
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I have replaced a whole bunch of addressable Ionization smoke detectors at one of our sites with FSP 851 (photo-electric), including electrical room and hydro vault. After couple of days, devices in hydro vault and electrical room gave me an error DET FAILED TEST. I went ahead and replaced them with brand new ones. at this point, trouble reappeared third time, now i installed addressable heat which is rated for operation of -20. 2 days later, same trouble is back and only for those two devices, now, my question, is it possible that magnetic field from transformers is screwing something up ?