Hi. We have just bought a new house that belonged to an elderly couple who both passed away. The house has an alarm - the Optima XL6 which is on - not set. We have no code at all for it. Is there any way we reset it? The estate agents had no code and the couple had no family so no one actually knows the code for it. It did go off today and rang for 20 mins before stopping as no one knew how to stop it. The light on the box outside is now flashing!! Any ideas would be appreciated? Many Thanks.