Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -red4d9f0a8493695e63d4b226d1c3d885a00b7565 -r81c902fb595b9fcde229f8898d14e43312969f26
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision ed4d9f0a8493695e63d4b226d1c3d885a00b7565)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 81c902fb595b9fcde229f8898d14e43312969f26)
@@ -145,15 +145,10 @@
 static F32 shortFilteredArterialPressure;                                       ///< Measured arterial pressure after short (1 s) filter.
 static F32 shortFilteredVenousPressure;                                         ///< Measured venous pressure after short (1 s) filter.
 
-static U32 airPumpOpenToleranceTimer;                                           ///< Timer for increased maximum venous high limit.
-
 static U32 bloodPumpOcclusionAfterCartridgeInstall;                             ///< Measured blood pump occlusion reading taken after cartridge install.
 
 static U32 emptySalineBagCtr = 0;                                               ///< Timer counter for empty bag detection.
 
-static U08 lastBPOcclReadCtr;                                                   ///< Previous BP occlusion sensor read count.
-static U08 lastBPErrorCtr;                                                      ///< Previous BP error count.
-
 static F32 artPressureReadingsLong[ SIZE_OF_LONG_ART_ROLLING_AVG ];             ///< Holds flow samples for long arterial pressure rolling average.
 static U32 artPressureReadingsLongIdx = 0;                                      ///< Index for next sample in rolling average array.
 static F32 artPressureReadingsLongTotal = 0.0;                                  ///< Rolling total - used to calc average.
@@ -211,21 +206,12 @@
     initFPGAPersistentAlarm( FPGA_PERS_ERROR_VENOUS_PRESSURE_SESNOR, ALARM_ID_HD_VENOUS_SENSOR_FPGA_FAULT,
                              PRES_SENSORS_FPGA_ERROR_TIMEOUT_MS, PRES_SENSORS_FPGA_ERROR_TIMEOUT_MS );
 
-#ifndef _RELEASE_
-    if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_PRESSURE_CHECKS ) != SW_CONFIG_ENABLE_VALUE )
-#endif
-    {
-        lastBPOcclReadCtr = 0;
-        lastBPErrorCtr    = 0;
-    }
-
     longFilteredArterialPressure        = 0.0F;
     shortFilteredArterialPressure       = 0.0F;
     shortFilteredVenousPressure         = 0.0F;
     presOcclDataPublicationTimerCounter = DATA_PUBLISH_COUNTER_START_COUNT;
     presOcclState                       = PRESSURE_WAIT_FOR_POST_STATE;
     presOcclPostState                   = PRESSURE_SELF_TEST_STATE_START;
-    airPumpOpenToleranceTimer           = 0;
 
 #ifndef _RELEASE_
     if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_PRESSURE_CHECKS ) != SW_CONFIG_ENABLE_VALUE )
@@ -458,15 +444,6 @@
 
     // Record occlusion sensor readings
     bloodPumpOcclusion.data = (U32)getFPGABloodPumpOcclusion();
-
-#ifndef _RELEASE_
-    if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_PRESSURE_CHECKS ) != SW_CONFIG_ENABLE_VALUE )
-#endif
-    {
-        // Record occlusion read and error counters for next time around
-        lastBPOcclReadCtr = bpReadCtr;
-        lastBPErrorCtr    = bpErrorCtr;
-    }
 }
 
 /*********************************************************************//**
@@ -485,6 +462,8 @@
     if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_ARTERIAL_PRESSURE_CHECK ) != SW_CONFIG_ENABLE_VALUE )
 #endif
     {
+        TREATMENT_STATE_T txState = getTreatmentState();
+
         // Check arterial pressure is in range
         if ( TRUE == isPersistentAlarmTriggered( ALARM_ID_HD_ARTERIAL_PRESSURE_OUT_OF_RANGE,
                                                  ( artPres > ARTERIAL_PRESSURE_MAX_MMHG || artPres < ARTERIAL_PRESSURE_MIN_MMHG ) ) )
@@ -494,7 +473,8 @@
 
         // Check arterial pressure during treatment mode
         if ( ( MODE_TREA == getCurrentOperationMode() ) &&
-             ( TREATMENT_DIALYSIS_STATE == getTreatmentState() ) && ( getDialysisState() != DIALYSIS_SALINE_BOLUS_STATE ) )
+             ( ( TREATMENT_BLOOD_PRIME_STATE == txState ) ||
+               ( ( TREATMENT_DIALYSIS_STATE == txState ) && ( getDialysisState() != DIALYSIS_SALINE_BOLUS_STATE ) ) ) )
         {
             F32 artLowLimit  = (F32)getTreatmentParameterS32( TREATMENT_PARAM_ART_PRESSURE_LOW_LIMIT );
             F32 artHighLimit = (F32)getTreatmentParameterS32( TREATMENT_PARAM_ART_PRESSURE_HIGH_LIMIT );