Date:   4/1/2015 8:49:54 PM ( 9 y ago)
Hits:   1,887
URL:   https://www.curezone.org/forums/fm.asp?i=2246351

Find or download a copy of the manual. It probably needs maintenance (usually a filter change).

Mine beeps when the AC is off and the unit is turned on (failsafe alarm for life support).
 

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