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Question About Nighthawk Carbon Monoxide Alarm KN-COP-HW
Alarm came on & won't stop...

The alarm came on and won't stop. It reads Err (Error, obviously) and/or CO9 When reset button is pushed, it does not reset, but continues to read Err and to beep. It's a Nighthawk, installed into the wall in 2007, when the home was built.

Asked by Elaine on 03/20/2009 1  Answer

ManualsOnline posted an answer 15 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

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