Just had Kidde CO Alarm installed. Alarm is chirping every 30 seconds. model KN_COP_IC ERR code: E04 Can't get chirping to stop.

SOURCE: 1 chirp every 30 seconds

it is not the battery problem, you need to get a replacement.
the circuite board is bad.

Tom Andersen

• 2 Answers
• Posted on Nov 23, 2010

SOURCE: The CO alarm started to beep every 30 seconds. I

They only last 7 years, after which they beep every 30 secs. You need new ones.

SOURCE: MODEL KN-COP-DP MFG 2003 GETTING ERR AND BEEPING

If the display shows "Lb", the battery is probably low; replace it. Make sure you are buying brand-name batteries, EverReady, DuraCell, etc. not some cheap knock-off brand you may never have heard of. There is absolutely no quality control or minimum performance specifications for batteries that are marketed in the US and there is some REAL trash out there. If the display shows "Err", push and hold the Peak Level button. Does the display change to "E09"? If so, then you have just been "had" by the grossly under-documented "planned obsolescence feature" called, rather matter-of-factly, "End of Life". This means that ~7 years after first being powered up, the unit will, BY DESIGN, cease to function, forcing you to buy a replacement. Would have been nice of Kidde to include THAT warning on the OUTSIDE of the package. Call their "Hotline" at 1-800-880-6788 and tell them what you think of that policy. If it is still under warranty (5 or 7 years depending on date of manufacture) they should replace it. In any event, buy another one; if they replace your first one you will have twice the protection. Not a bad thing. *Disclaimer: I am not a lawyer, despite the handle. Words to live by: "Every creative act results from a sudden cessation of stupidity." -Edwin H. Land, inventor of the Polaroid Land Camera"The problem can always be solved with the materials in the room." -My college Physics Lab Instructor

SOURCE: I have a KIDDE /

Normally, that means the battery(s) need changing.. But, hundreds people have had problems with this combo detector, it's hard to predict what it is.

But, as I said earlier, "Normally that means the battery(s) need changing." The keyword here is "Normally".

Good luck. I hope that solves your problem.