The system is designed so that all of the alarms will sound when smoke or CO is detected on any of them. You can silence them by pressing and holding the test button. If the alarm goes off, the system will continue to sound an alarm as long as there is smoke or CO detected. If you just have a weak back up battery, only the unit with the weak battery will beep every 15 seconds or so, until you replace the battery. It will continue the beeping even if you remove the battery, but do not replace it. If a unit is defective, it should give 3 short beeps every 15 seconds until you replace the unit. It sounds like you may have a defective unit, but it may not have signaled as such with the 3 beep notification.
Last edited by retiredguy123; 05-13-2021 at 11:57 AM.
Reason: Typos
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