What to do if the Supply fault LED is illuminated on my Ampac Fire Alarms?
- BBeverly Torres MDSep 12, 2025
If the Supply fault LED is illuminated on your Ampac Fire Alarms, check the output voltage; it should be set to 27.2VDC. A low voltage is less than 26.5VDC, and a high voltage is greater than 28VDC. Also, check that the battery has been connected properly.