Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -r1c628bfd5d6414b74b8cbd083f66839888a8236b -r42fe309ff246de72d1ed42fba291e792630d1e12
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 1c628bfd5d6414b74b8cbd083f66839888a8236b)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 42fe309ff246de72d1ed42fba291e792630d1e12)
@@ -24,7 +24,8 @@
 #include "SystemCommMessages.h"
 #include "TaskGeneral.h"
 #include "Temperatures.h"
-#include "Timers.h"
+#include "Timers.h"
+#include "Valves.h"
 
 /**
  *  @addtogroup PressureOcclusion
@@ -579,9 +580,13 @@
         F32 venHighLimit = (F32)getTreatmentParameterS32( TREATMENT_PARAM_VEN_PRESSURE_HIGH_LIMIT );
 
 #ifndef DISABLE_PRESSURE_CHECKS
-        if ( TRUE == isPersistentAlarmTriggered( ALARM_ID_VENOUS_PRESSURE_LOW, venPres < venLowLimit ) )
+        // Cannot monitor for low venous pressure while venting air trap
+        if ( STATE_OPEN == getValveAirTrapStatus() )
         {
-            SET_ALARM_WITH_2_F32_DATA( ALARM_ID_VENOUS_PRESSURE_LOW, venPres, venLowLimit );
+            if ( TRUE == isPersistentAlarmTriggered( ALARM_ID_VENOUS_PRESSURE_LOW, venPres < venLowLimit ) )
+            {
+                SET_ALARM_WITH_2_F32_DATA( ALARM_ID_VENOUS_PRESSURE_LOW, venPres, venLowLimit );
+            }
         }
 
         if ( TRUE == isPersistentAlarmConditionCleared( ALARM_ID_VENOUS_PRESSURE_LOW, venPres < venLowLimit ) )