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Old 10-17-2017, 02:31 PM
crash crash is offline
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The 3 beeps was probably coming from the dual detector and tells you to replace the detector. The reset process you did will shut up the alarm for about 2 weeks then it will beep again. After 2 resets it will no longer reset and will not shut up unless you unplug it and remove the battery.

When it is the battery it will just issue a single beep at a regular interval.