Index: firmware/App/Modes/Prime.c
===================================================================
diff -u -rd367cda979e9684a25b0d4d5df52bbcf4f3c0acf -rba64f5e5557bef379a42531be63dcc1ee67c167d
--- firmware/App/Modes/Prime.c	(.../Prime.c)	(revision d367cda979e9684a25b0d4d5df52bbcf4f3c0acf)
+++ firmware/App/Modes/Prime.c	(.../Prime.c)	(revision ba64f5e5557bef379a42531be63dcc1ee67c167d)
@@ -60,8 +60,9 @@
 #define LOAD_CELL_STEADY_VOLUME_SAMPLING_TIME               (  1 * MS_PER_SECOND )                             ///< Time load cell reading steady state detection sampling time in seconds.
 #define PRIME_DIALYSATE_BYPASS_TIME_LIMIT                   ( 8 * MS_PER_SECOND )                              ///< Time limit for priming dialysate bypass circuit.
 #define STEADY_VOLUME_COUNT_SEC                             ( 10000 / LOAD_CELL_STEADY_VOLUME_SAMPLING_TIME )  ///< Counter must be greater than 10 seconds before steady volume is true.
-#define STEADY_VOLUME_DIALYSATE_PRIME_TIME_LIMIT_MS         ( 55 * MS_PER_SECOND )                             ///< Time in msec for the reservoir volume to stabilize during dialysate prime state.
+#define STEADY_VOLUME_DIALYSATE_PRIME_TIME_LIMIT_MS         ( 90 * MS_PER_SECOND )                             ///< Time in msec for the reservoir volume to stabilize during dialysate prime state.
 #define STEADY_VOLUME_BYPASS_PRIME_TIME_LIMIT_MS            ( 62 * MS_PER_SECOND )                             ///< Time in msec for the reservoir volume to stabilize during bypass dialysate prime state.
+#define STEADY_VOLUME_DIALYSATE_PRIME_HISTERESIS_ML         ( 0.3F )                                           ///< mL of histeresis for the steady state check that determines when bypass line is primed.
 #define STEADY_VOLUME_BYPASS_PRIME_HISTERESIS_ML            ( 0.3F )                                           ///< mL of histeresis for the steady state check that determines when bypass line is primed.
 
 #define VENOUS_PRESSURE_BUBBLE_CLEAR_MAX_MMHG               ( 200.0F )                                         ///< Maximum venous pressure reading (in mmHg) for bubble clear.
@@ -776,7 +777,7 @@
         {
             F32 const currentReservoirVolume = getLoadCellWeight( LOAD_CELL_RESERVOIR_1_PRIMARY );
 
-            if ( currentReservoirVolume >= minimumReservoirVolume )
+            if ( currentReservoirVolume >= ( minimumReservoirVolume - STEADY_VOLUME_DIALYSATE_PRIME_HISTERESIS_ML ) )
             {
                 if ( ++steadyVolumeCount >= STEADY_VOLUME_COUNT_SEC )
                 {
@@ -785,9 +786,12 @@
             }
             else
             {
-                minimumReservoirVolume = currentReservoirVolume;
                 steadyVolumeCount = 0; // required 10 seconds continuous steady volume to transition to next state
             }
+            if ( currentReservoirVolume < minimumReservoirVolume )
+            {
+                minimumReservoirVolume = currentReservoirVolume;
+            }
 
             steadyVolumeSamplingStartTime = getMSTimerCount();       // re-armed the timer for the next dVolume/dt check
         }