As above if an intruder alarm fails to perform your insurance company would claim from the maintaner. Thats why Insurance companies want an approved company as they have to have the specialist insurance for this. As such systems are locked down to prevent an innocent change to the config actually having unforseen problems. So without that you may not have a valid insurance cover
agreed looks like a big blustu, maybe an isdn one?
also looks more like outputs in use apart from pin 1. Is it on a Fire panel?
However just a heads up not sure it ever passed CE
oh
Im sure they are answering their supported clients.
But assuming no-ones been fiddling with it you should be able to reset it with your master code.
It could be a faulty sensor. Cover it over and see if the activations stop. That will show if its in the room or something else.
When was it last serviced etc?