I have an accenta G3 which has been fine for some years Recently there has been a problem with a door contact causing false alarms I have changed both the contact and the magnet twice But now the alarm wont set I link out the circuit in question (5) and the alarm sets so you would think faulty cable or faulty contact yet the contact bells through to the panel when tested with a multi meter and appears to work perfectlyThe alarm works when the circuit is linked out but wont set when the contact is connected as said i have tried 2 new contacts but still no joy Any Ideas ??