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Question About Nighthawk Carbon Monoxide Alarm KN-COPP-3
alarm continues to beep and show Err. after new ba...

alarm continues to beep and show Err. after new battery is installed. i have taken unit outside for fresh air and tested new battery. when you press test button you get 888 then Err and beep. has the alarm gone bad?

Asked by rex on 03/11/2013 1  Answer

ManualsOnline posted an answer 11 years, 1 month 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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