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Check the date on the back of the smoke alarm. They need to be replaced about every 7 years. They also need to be cleaned once or twice a year, you can use a vacuum to do this. If they are older replace them.
do they beep three times, pause then beep three times again? if so, they are going into alarm. since they all ring together, the only way to tell which one is causing the problem is to look for one where the leds are different than the others. If your detectors are more than 10 years old, replace them all as required by the national fire code (NFPA72). If they are only doing single chirps, that is usually an indication of a low battery...perhaps the breaker for the circuit has tripped causing them to run on battery only. good luck
copied from the manual, available at the kidde website
RED AND GREEN LED INDICATORS This smoke alarm features separate red and green LED indicators. The LEDs indicate the following: GREEN LED CONSTANT ON - AC power is present. OFF - AC power is not present. RED LED - Can be seen through the Push-to-Test button. Blinks once a minute - Indicating presence of a working battery. Blinks once a second - Smoke alarm senses smoke and simultaneously sounds an audible alarm. Blinks once every 10 seconds - Smoke alarm is quieting an unwanted alarm (Model ADC only). (Interconnected system only): OFF - Another smoke alarm in the network has sensed smoke and is signalling this alarm.
if it is about a smoke alarm with a battery in it, when the alarm beeps for no apparent reason, it is a bult in indicator that the battery is flat or approaching a low voltage and needs replacing
If it still beeps after replacing the battery have it checked out as a fire alarm is critical for your safety
Check that the battery is installed the right way around. Most smoke alarms can only be tested manually (by pushing the button). If you are hearing a single beep every 50 or 60 seconds then this is the low battery indicator and this will sound if the battery is inserted the wrong way around. If the siren is actually sounding continually then your smoke alarm might be clogged with dust or other foreign matter. All smoke alarms should be replaced every 5 to 7 years as the components in them only have a limited life span.
Make sure to only use a brand name alkaline 9 volt battery. Don't use a used battery or a dollar store battery (bargain store). Then press the test button for 10 seconds to reset this unit and any more down the line.
All smoke detectors need batteries often. The voltage must be 1.5 volts higher than what the voltage says on the battery used. Also electronics these days are touchy that you only use alkaline. So buy a new brand name alkaline that hasn't been on the shelve very long. Never use a used battery from another device in the house. Never buy the cheapest deal battery from a dollar store etc. Once the battery is replaced press the test button for 10 to 15 seconds to reset all. If you don't press the test button it may continue to beep or warn you. If you press the button just enough to test the alarm it may not reset properly. The longer 10 to 15 second test usually solves all issues.