If it is a Signature then it is probably locked out. If you have no codes & can't use it anyway then try this. Assuming that the system has been depowered, open up the control box & remove the battery which will need replacing. Connect one lead to the battery & then hold down the default button ( little black push button to the left of centre at top of circuit board) while you connect the other battery lead. This will default the panel to factory settings. enter 1234Away & you will get into programming. enter 960away to exit programming. If you get this far then chase up a programming manual to reprogram the panel , it's not that hard. If you want monitoring or ring a mobile then you may be better off getting a tech in
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