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Readings You May See When Unit is AC Powered Display Shows Alarm Sound Unit Status Recommended Action Steady "Err" "Chirp" every Unit malfunctioning when Call KIDDE customer and flashing dot 30 seconds AC powered service at 1-800-880-6788 Readings You May See When Unit is on Temporary Battery Backup Display Shows Alarm Sound Unit Status Recommended Action Flashing dot None Normal battery-only operation - Plug in to AC as soon as unit will show reading only if it possible to conserve battery senses CO Flashing dot and "Chirp" every Unit malfunctioning when Call KIDDE customer "Err" 30 seconds battery powered service at 1-800-880-6788
Hope this helps. Manual is here: http://www.detectorsandalarms.com/images/pdf/Manual_KN-COPP-3_900-0100en.pdf
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Thats something you would need the service manual for to be able to see which part is malfunctioning. I would recommend going to the following link as they will most likely have the service manual for your model which they sell very reasonable and it comes with free tech support so you acn go one on one with a repair tech that will help you get it going. If you dont see your model just leave them an email as they most certainly can get it. They email the manuals out instantly and support is handled my on line instant messaging. Its a good service I am one of their support techs. here's the link. http://servicemanuals.vstore.ca/