I have an infinite prime alarm system with wireless PIRs. Having some building work done, and one of the PIR was removed from the wall, setting off the tamper alarm. Now the system will not set without me clearing (I presume) the alarm on the PIR. I have the master code , but that does not seem to be able to get me into the programming menu (WHY??) and I don't think that I know the installer code. I cannot get hold of the guy that originally set up the system, so am a little stuck. Any clues or tips for me ? Very nervous about not being able to set the alarm.