Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -rdb291cc22fd8f10e6e47cad468e14ed5590a94f2 -r5dc15621f83c8fe19da6b82b4492102d699a8a14
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision db291cc22fd8f10e6e47cad468e14ed5590a94f2)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 5dc15621f83c8fe19da6b82b4492102d699a8a14)
@@ -45,6 +45,8 @@
 #define PRES_LIMIT_STABILIZATION_TIME_MS    ( 60 * MS_PER_SECOND )                          ///< Duration of pressure limit stabilization period (in ms).
 #define PRES_LIMIT_SHORT_STABILIZE_TIME_MS  ( 10 * MS_PER_SECOND )                          ///< Duration of pressure limit short stabilization period (in ms).
 #define PRES_LIMIT_RESTABILIZE_TIME_MS      ( 30 * SEC_PER_MIN * MS_PER_SECOND )            ///< Duration of pressure limit re-stabilize period (in ms).
+// Pressure Limit minimum stabilization time before short stabilization time activation
+static const U32 PRES_LIMIT_MIN_STABILIZATION_TIME_IN_MS = ( PRES_LIMIT_STABILIZATION_TIME_MS - PRES_LIMIT_SHORT_STABILIZE_TIME_MS ) ;
 
 #define ARTERIAL_PRESSURE_CONVERSION_OFFSET 0x800000                                        ///< Arterial pressure conversion coefficient.
 #define ARTERIAL_PRESSURE_V_BIAS            ( 3.0F )                                        ///< Bias voltage for arterial pressure sensor.
@@ -450,15 +452,24 @@
  *************************************************************************/
 void signalInitiatePressureStabilization( BOOL useShort )
 {
-    useShortStabilizeTime = useShort;
-
     // User update of blood/dialysate flow rate or UF rate or  initiates/resets a stabilization period (if we were in stabilization or stable state)
     if ( PRESSURE_LIMITS_STATE_STABILIZATION == currPresLimitsState )
     {
-        stabilizationStartTimeMs = getMSTimerCount();
+        U32 currentTime = getMSTimerCount();
+        U32 expiredTime = u32DiffWithWrap( stabilizationStartTimeMs , currentTime );
+
+        // if pressure is already stabilized enough, assign the short stabilize time for the recent event ( air pump on).
+        // else,leave the current/on going stabilization to expire due to long pending stable time to settle down the pressure.
+        // allow Normal stabilization on a case when user updates flow rate or UF rate etc.,
+        if ( expiredTime >  PRES_LIMIT_MIN_STABILIZATION_TIME_IN_MS || useShort == FALSE )
+        {
+            useShortStabilizeTime    = useShort;
+            stabilizationStartTimeMs = getMSTimerCount();
+        }
     }
     else if ( PRESSURE_LIMITS_STATE_STABLE == currPresLimitsState )
     {
+        useShortStabilizeTime = useShort;
         currPresLimitsState = PRESSURE_LIMITS_STATE_STABILIZATION;
         stabilizationStartTimeMs = getMSTimerCount();
     }