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Question About Nighthawk Carbon Monoxide Alarm KN-COPP-3
My alarm goes off and says err. I replaced the ba...

My alarm goes off and says err. I replaced the battery and as soon as I hook up a new one the alarm goes off and says err again. I put it outside in the freshair and it still goes off and says err.

Asked by Peggy on 12/20/2014 1  Answer

ManualsOnline posted an answer 9 years, 9 months ago

The ManualsOnline team has found the manual for this product! We hope it helps solve your problem. Get the Manual Here

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