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Question About Nighthawk Carbon Monoxide Alarm KN-COPP-3
KN-COPP-3...

Units chirps and displays "Err". I replaced the battery. "Err" won't go away and it still chirps, whether plugged into an outlet or not.

Asked by Steven on 01/16/2011 1  Answer

ManualsOnline posted an answer 13 years, 3 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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