Err is showing and beeping. Press right button and E09 appears. Press left button and 888 appears. 9 Volt battery has been replaced. Beep continues. Is this serious or do we just need a new monitor? Model Number KN-COPP-3 Assemby Number: 900-0076 Manufactured: October 10, 2005 Issue 2699
SOURCE: Nighthawk carbon monoxide alarm model kn-copp-b
Here is a link to the manual, or you can call the consumer hotline at 1-800-880-6788
SOURCE: Nighthawk carbon monoxide alarm model
1. Change batteries.
2. Clean it.
3. Swap it with another location if you can.
If it still does not work properly consult the local fire dept. for free.
You may have to take it in repairs if all fails.
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