If it is a First Alert detector, 3 beeps on regular time intervals indicates that the detector is defective. If you have replaced it with a new detector, I would make sure it is properly plugged in to the base unit. If so, I would return it for a new one. If that doesn't work, you may have a wiring problem with the system that interconnects all of the detectors in your house. To test that, I would plug in another detector from your house that you know is working and see if it still beeps. Another solution would be to buy a 10-year, stand alone detector with a sealed battery. That type does not need to be connected to the house wiring and can be mounted anywhere on the wall.
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