Index: firmware/App/Modes/Prime.c
===================================================================
diff -u -r5195e227eaa5e39317e3869406dfbd7da3949fd3 -r1c17c977d1615b0c96078fd142aa90cd44ef9118
--- firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 5195e227eaa5e39317e3869406dfbd7da3949fd3)
+++ firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 1c17c977d1615b0c96078fd142aa90cd44ef9118)
@@ -589,8 +589,9 @@
 
     if ( TRUE == getReservoirFillStatus( DG_RESERVOIR_1 ) )
     {
+        cmdSetDGActiveReservoir( DG_RESERVOIR_1 );
 
-        if ( DG_RESERVOIR_1 == getDGActiveReservoir() )
+        if ( TRUE == hasDGCompletedReservoirSwitch() )
         {
             U32 dialyzerDialysateVolume = getDialyzerDialysateVolume();
 
@@ -769,7 +770,9 @@
 
     if ( TRUE == getReservoirFillStatus( DG_RESERVOIR_2 ) )
     {
-        if ( DG_RESERVOIR_2 == getDGActiveReservoir() )
+        cmdSetDGActiveReservoir( DG_RESERVOIR_2 );
+
+        if ( TRUE == hasDGCompletedReservoirSwitch() )
         {
             signalBloodPumpHardStop();
             setDialInPumpTargetFlowRate( DIALYSATE_PUMP_PRIME_FLOW_RATE_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );