The Autowatch 695 alarm went off on our new Burstner this morning just before 7am. Also went off this evening at 9pm. When I went in after the latest event I found a daddy long legs sitting on the ceiling. Is there any chance this may have set off the PIR. I thought these react to a moving warm body. Needless to say I have now turned off the internal sensors and will be keeping the keys close at hand. There is apparently no way of finding out what caused the alarm. Unless of course someone on here knows different!