Scantronic 9200 still will not reset?

Thanks to Neil from Tritec alarms for replying, the Scantronic alarm system will not reset,this is following a very kind double glazing installer who cut through the alarm wires, there was a recessed sensor,which i have replaced with a new surface mounted sensor,i have carried out a continuity test and this seems okay ,the alarm will still not set.
Is there a special code in addition to the normal door entry code for resetting the system