Index: /fact/FADctrl/FADBoard.cc
===================================================================
--- /fact/FADctrl/FADBoard.cc	(revision 11424)
+++ /fact/FADctrl/FADBoard.cc	(revision 11425)
@@ -537,5 +537,6 @@
 	  
 	  // Check if trigger cells resonable (to trace FAD 'double signal' bug)
-	  if (abs((min_element(Status.TriggerCell,Status.TriggerCell+4) - max_element(Status.TriggerCell,Status.TriggerCell+4) + 1024)%1024) > 20) {
+	  int Diff = abs((max_element(Status.TriggerCell,Status.TriggerCell+4) - min_element(Status.TriggerCell,Status.TriggerCell+4)));
+	  if (Diff > 20 && Diff < 1000) {
 		SetStatus("Warning: Trigger cell mismatch board %s, cells are %d %d %d %d", Name, Status.TriggerCell[0], Status.TriggerCell[1], Status.TriggerCell[2], Status.TriggerCell[3]);
 		m->Message(m->WARN, "Trigger cell mismatch board %s, cells are %d %d %d %d", Name, Status.TriggerCell[0], Status.TriggerCell[1], Status.TriggerCell[2], Status.TriggerCell[3]);