Kidde Model # KN-COSM-IB Combination CO2/Smoke Detector
If you have the Kidde brand of smoke/CO2 detector in your apartment, it will look like the image on the left. The battery compartment will be in the back of the unit and it requires a 9V Battery. If the detector is making a single beep or “chirp” every 30 seconds, then you need to disconnect the detector from the ac wiring by gently squeezing the white tab inward with two fingers and pulling it out. You then will need to remove the old 9V Battery and put a new one in. Please note: If you did not hear the voice that stated “Low Battery”, or if you put a new battery in and the detector still beeps, then you need to reset the detector. You can reset the detector by following these simple steps:
- Remove the detector from its mounting bracket and the ac wiring by gently squeezing the white tab inward with two fingers and pulling it out from the detector.
- Remove the 9V Battery. Discard the battery if it is old.
- With the battery removed, press and hold the test button for 15-20 seconds.
- Place a brand new, never used (important) 9V battery in the detector and plug in the 3 prong white tab connector from the wall to the detector.
- When the power is restored, the detector should chirp and run through a test cycle. After that is complete, the detector will be reset and you should not hear any more beeping or chirping.
A good rule of thumb and industry standard is to change the batteries in your smoke detector every 6 months. The new battery should last for about 1 year and the manufacturer recommended battery brand is Duracell. For more information, the instruction manual can be downloaded by this link: Kidde Manual
First Alert Model # SC9120B Combination C02/Smoke Detector
The instruction manual can be downloaded by this link: First Alert Manual
If you changed the batteries and you are still having difficulty with the detector, please send in a maintenance request so we can get it taken care of right away. Thank you.