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That should have either a Magnetek or a WFCO power center which is located near the floor level. Dark brown cover. Most will be in the kitchen area.............usually under the fridge or stove. I don't know what would cause a "loud siren sound" on this, unless it was the LP detector, which can make loud screeching sound when the battery voltage gets too low. I would check that first. Bad batteries or those low on water make up the majority of issues we see here. The charging may not be working correctly and that can be checked with a small digital multimeter. About $20 or so at most hardware stores and easy to use. I can direct you in the testing. All follow ups are included in our fee, so please get back to me if you need more here.