PIR cable cut?

Hi. Carpet fitters cut through the 8 core cable from one of my PIR's back to the Accenta 6 control box. I've reconnected (soldered/sleeved joints) 'colour to colour'. Now, when I try to set the alarm, I get a fault condition indicated on all zones. I've tried resetting etc but without success, the fault persists. Do I need to reprogramme?