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Question About Nighthawk Carbon Monoxide Alarm KN-COPP-3
My Nighhawk model # KN-COPP-3 Carbon Monoxide dete...

My Nighhawk model # KN-COPP-3 Carbon Monoxide detector showed "Err" message in the window. When I replaced the battery, it briefly shwed "888" but when I turned over the detector it went back to "Err" and a beep every 25-30 sec. What's wrong and how do I fix it?

Asked by Yogesh Kansal on 10/04/2012 2  Answers

ManualsOnline posted an answer 11 years, 6 months ago

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

Yogesh Kansal posted an answer 11 years, 6 months ago

0 I have the manual but it is of no help.
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