Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -rda7e8c1b71db9273f83e9d0ba7d20e74e758a8ad -r221f2d32da9044362aa7a30761e1fc9e7a218a86
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision da7e8c1b71db9273f83e9d0ba7d20e74e758a8ad)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 221f2d32da9044362aa7a30761e1fc9e7a218a86)
@@ -17,7 +17,8 @@
 
 #include "PresOccl.h"
 #include "AirPump.h"
-#include "AlarmMgmt.h"
+#include "AlarmMgmt.h"
+#include "BloodFlow.h"
 #include "FPGA.h"
 #include "ModeTreatmentParams.h"
 #include "NVDataMgmt.h"
@@ -644,7 +645,8 @@
         // and setOcclusionInstallLevel has been called.
         if ( MODE_PRET == getCurrentOperationMode() )
         {
-            if ( getPreTreatmentSubState() > HD_PRE_TREATMENT_CART_INSTALL_STATE && getDrySelfTestsState() > DRY_SELF_TESTS_START_STATE )
+            if ( ( TRUE == isBloodPumpRunning() ) && ( getPreTreatmentSubState() > HD_PRE_TREATMENT_CART_INSTALL_STATE )
+                    && ( getDrySelfTestsState() > DRY_SELF_TESTS_START_STATE ) )
             {
                 // Check for occlusion
                 if ( bpOccl > ( OCCLUSION_THRESHOLD_OFFSET + bloodPumpOcclusionAfterCartridgeInstall ) )
@@ -658,7 +660,7 @@
         // Check for occlusion in Treatment modes where pumps are moving
         else if ( MODE_TREA == getCurrentOperationMode() )
         {
-            if ( TREATMENT_STOP_STATE != getTreatmentState() )
+            if ( ( TRUE == isBloodPumpRunning() ) && TREATMENT_STOP_STATE != getTreatmentState() )
             {
                 // Check for occlusion
                 if ( bpOccl > ( OCCLUSION_THRESHOLD_OFFSET + bloodPumpOcclusionAfterCartridgeInstall ) )