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Question About Nighthawk Carbon Monoxide Alarm KN-COPP-3
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Asked by Paul on 01/09/2009 0  Answer

ManualsOnline posted an answer 15 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

William posted an answer 15 years, 7 months ago

0 Mine had a code L6 on the screen. I took the back cover for the battery off. I took out the 9 volt battery and checked out the voltage and it was bad. I replaced the 9 volt battery and the tester has been fine ever since
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