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Question About Nighthawk Carbon Monoxide Alarm KN-COPP-3
following the the replacement with a new battery ...

following the the replacement with a new battery and pushing the test button the number is not Zero, but 888 with a dot below the third eight..few seconds later this 888 changes to Err. What is the reason?

Asked by Suzanne on 03/16/2014 1  Answer

ManualsOnline posted an answer 10 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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