Smoke detectors are great safety devices. But occasionally a smoke detector will start "chirping" or worse, sound a non-stop alarm for no reason. Here's what you can do if this happens to you:
If it's a battery-powered smoke detector, take out the battery and replace it with a new one. If there's still a problem, replace the entire smoke detector.
If it's a 120 Volt powered smoke detector (hard-wired), turn off your circuit breakers one by one until the noise stops. Then turn on all the circuit breakers again except the one controlling the smoke detector. Replace the faulty smoke detector and turn its circuit breaker back on again.
You will then need to replace the 120 Volt smoke detector or if it is a battery powered smoke detector, replace the battery.