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Is it the LP detector? Near the floor? Is the alarm still on after you disconnected the batteries?
Could you find the source? Near the floor or on the wall or ceiling? Must have an internal battery or if it was the LP detector that is on all the time. Ozone can do this as do some cleaning products.
It might have been from the extra electricity in the air as well.
Did you get this resolved or do you still need some assistance here?