if you arm it and walk test and sirens work you mightbe doing the tests wrong, you have to hold the 1, 2 or 3 button in until you hear the 3 beeps. you didint bump any wires when changing the battery?
you might have accidently activated the chime function, cant remmeber the number to press off the top of my head but im sure someone will post it up to disable it
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