I have a nighthawk 810-10429 unit located on the upper floor of my house. Unit installed when home built in 2003. It is wired into the electrical and I can't readily see if there is a battery to replace in it. It has been beeping in a cycle of about every 10 -15 minutes followed by additional beeps a couple minutes apart.
Don't know how to stop it. I've taken the cover off as it is not sitting properly with the green and red plastic covered strips. Perhaps it needs replacing but the others in the home are fine and are the same age.
If you can guide me in trouble shooting this, please let me know.
Even though it is is hard-wired, it still has a 9 volt battery for back-up operation during power outtages. Unplug it, turn it over and you will see the battery compartment. 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 Read More At : Nighthawk Combo Gas/co Detector...