Index: firmware/App/Modes/Prime.c
===================================================================
diff -u -rb29da200407a214659556e9996a4a8de77c5b147 -r6eca5afbe0ffc3e613ff743208d046a57b3408c6
--- firmware/App/Modes/Prime.c	(.../Prime.c)	(revision b29da200407a214659556e9996a4a8de77c5b147)
+++ firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 6eca5afbe0ffc3e613ff743208d046a57b3408c6)
@@ -65,6 +65,7 @@
 #define BUBBLE_CLEAR_WAIT_TIME_INITIAL_MS                   ( 10 * MS_PER_SECOND )                             ///< Time in msec to wait for initial bubble clear pressure.
 #define BUBBLE_CLEAR_WAIT_TIME_MS                           ( 2 * MS_PER_SECOND )                              ///< Time in msec to wait for bubble clear pressure.
 #define BUBBLE_CLEAR_MAX_TIME_MS                            ( 5 * MS_PER_SECOND )                              ///< Time in msec maximum for bubble clear pressure.
+#define BUBBLE_CLEAR_VALVE_WAIT_TIME_MS                     ( 90 )                                             ///< Time in msec between VDi to VBT opening after bubble clear pressure.
 
 /// States of the treatment reservoir management state machine.
 typedef enum PrimeReservoirMgmt_States
@@ -518,7 +519,9 @@
  *************************************************************************/
 static void handlePrimeBubbleClear( void )
 {
+    static BOOL bubble_clear_ended = FALSE;
     U32 timeout;
+
     if ( FALSE == bubbleClearActive )
     {
         if ( TRUE == primeFirstBubbleClearPass )
@@ -537,22 +540,32 @@
             primeSalineDialyzerBubbleClearStartTime = getMSTimerCount();
             if ( AIR_TRAP_LEVEL_AIR == getAirTrapLevel( AIR_TRAP_LEVEL_SENSOR_LOWER ) )
             {
-                setValvePosition( VDI, VALVE_POSITION_A_INSERT_EJECT );
+                setValvePosition( VDI, VALVE_POSITION_C_CLOSE );
                 setValveAirTrap( STATE_CLOSED );
                 bubbleClearActive = TRUE;
             }
         }
     }
-    else if ( ( getMeasuredVenousPressure() > VENOUS_PRESSURE_BUBBLE_CLEAR_MAX_MMHG ) ||
-         ( TRUE == didTimeout( primeSalineDialyzerBubbleClearStartTime, BUBBLE_CLEAR_MAX_TIME_MS ) ) )
+    else
     {
-        // Pressure max reached. or timeout, release pressure
-        setValvePosition( VDI, VALVE_POSITION_C_CLOSE );
-        setValveAirTrap( STATE_OPEN );
-        bubbleClearActive = FALSE;
-        primeSalineDialyzerBubbleClearStartTime = getMSTimerCount();
-    }
+        if ( ( getMeasuredVenousPressure() > VENOUS_PRESSURE_BUBBLE_CLEAR_MAX_MMHG ) ||
+           ( TRUE == didTimeout( primeSalineDialyzerBubbleClearStartTime, BUBBLE_CLEAR_MAX_TIME_MS ) ) )
+        {
+            // Pressure max reached. or timeout, release pressure
+            setValvePosition( VDI, VALVE_POSITION_A_INSERT_EJECT );
+            primeSalineDialyzerBubbleClearStartTime = getMSTimerCount();
+            bubble_clear_ended = TRUE;
+        }
+        else if ( ( TRUE == bubble_clear_ended ) &&
+                ( TRUE == didTimeout( primeSalineDialyzerBubbleClearStartTime, BUBBLE_CLEAR_VALVE_WAIT_TIME_MS ) ) )
+        {
+            setValvePosition( VDI, VALVE_POSITION_C_CLOSE );
+            setValveAirTrap( STATE_OPEN );
+            bubbleClearActive = FALSE;
+            bubble_clear_ended = FALSE;
+        }
 
+    }
 }
 
 /*********************************************************************//**