Please could I have some advice? Blue flashing light on exterior alarm box, no longer with this company so please would somebody advise me how to me switch it off? Thank you so much

it was in alarm and you have silenced it?

have you pressed reset?

assuming you dont care about it and not serviced etc?

do your neighbours a favour and decomission it before it causes you a problem

alternatively if your asking for the burglar code that kills a system,obviously it doesn't exist outside of diy grade systems