Index: firmware/App/Controllers/DialOutFlow.c
===================================================================
diff -u -rb660c59e56cd7cd0123206e918aacc4225cca94b -rbb648110d33fb859beed67fabc43f7e9614fc00a
--- firmware/App/Controllers/DialOutFlow.c	(.../DialOutFlow.c)	(revision b660c59e56cd7cd0123206e918aacc4225cca94b)
+++ firmware/App/Controllers/DialOutFlow.c	(.../DialOutFlow.c)	(revision bb648110d33fb859beed67fabc43f7e9614fc00a)
@@ -54,6 +54,7 @@
 #define MAX_DIAL_OUT_FLOW_RATE                  700             ///< Maximum dialysate outlet pump flow rate in mL/min.
 #define MIN_DIAL_OUT_FLOW_RATE                  100             ///< Minimum dialysate outlet pump flow rate in mL/min.
 
+#define MAX_DIAL_OUT_PUMP_PWM_CHANGE            0.05F           ///< Maximum duty cycle change allowed.
 #define MAX_DIAL_OUT_PUMP_PWM_STEP_UP_CHANGE    0.01064F        ///< Maximum duty cycle change when ramping up.
 #define MAX_DIAL_OUT_PUMP_PWM_STEP_DN_CHANGE    0.016F          ///< Maximum duty cycle change when ramping down.
 #define MAX_DIAL_OUT_PUMP_PWM_DUTY_CYCLE        0.90F           ///< Controller will error if PWM duty cycle > 90%, so set max to 89%.
@@ -846,12 +847,32 @@
             offsetPWMDutyCyclePct += ( ufrErr * P_UF );
 
             // Add PWM offset to DPi PWM mirror for our new DPo PWM
-            dialOutPumpPWMDutyCyclePctSet = getDialInPumpPWMDutyCyclePct( FALSE ) + offsetPWMDutyCyclePct;
+            dialOutPumpPWMDutyCyclePct = getDialInPumpPWMDutyCyclePct( FALSE ) + offsetPWMDutyCyclePct;
             // Limit PWM range
-            dialOutPumpPWMDutyCyclePctSet = MIN( dialOutPumpPWMDutyCyclePctSet, MAX_DIAL_OUT_PUMP_PWM_DUTY_CYCLE );
-            dialOutPumpPWMDutyCyclePctSet = MAX( dialOutPumpPWMDutyCyclePctSet, MIN_DIAL_OUT_PUMP_PWM_DUTY_CYCLE );
-            // Apply new PWM to DPo pump
-            setDialOutPumpControlSignalPWM( dialOutPumpPWMDutyCyclePctSet );
+            dialOutPumpPWMDutyCyclePct = MIN( dialOutPumpPWMDutyCyclePct, MAX_DIAL_OUT_PUMP_PWM_DUTY_CYCLE );
+            dialOutPumpPWMDutyCyclePct = MAX( dialOutPumpPWMDutyCyclePct, MIN_DIAL_OUT_PUMP_PWM_DUTY_CYCLE );
+
+            // change in PWM duty cycle should not cross the defined threshold value, if so, step changes should be applied
+            // to have gradual increase/decrease in PWM duty cycle. This is to avoid few undefined scenarios where sudden ramp down/up seen
+            // TODO : Need to define the threshold value, for now up to 5% change is allowed??
+            if( fabs( dialOutPumpPWMDutyCyclePct - dialOutPumpPWMDutyCyclePctSet ) > MAX_DIAL_OUT_PUMP_PWM_CHANGE )
+            {
+                if ( dialOutPumpPWMDutyCyclePctSet > dialOutPumpPWMDutyCyclePct )
+                {
+                    dialOutPumpState = DIAL_OUT_PUMP_RAMPING_DOWN_STATE;
+                }
+                else
+                {
+                    dialOutPumpState = DIAL_OUT_PUMP_RAMPING_UP_STATE;
+                }
+            }
+            else
+            {
+                dialOutPumpPWMDutyCyclePctSet = dialOutPumpPWMDutyCyclePct;
+                // Apply new PWM to DPo pump
+                setDialOutPumpControlSignalPWM( dialOutPumpPWMDutyCyclePctSet );
+            }
+
         }
     }
 
@@ -957,6 +978,7 @@
         dialOutBroadCastVariables.ufCalcRate       = ufMeasuredRate;
         dialOutBroadCastVariables.rotorHall        = ( hallSensor > 0 ? 0 : 1 );  // 1=home, 0=not home
         dialOutBroadCastVariables.currentSetUFRate = getCurrentUFSetRate();
+        dialOutBroadCastVariables.dialOutPumpState = (U32)dialOutPumpState;
 
         broadcastData( MSG_ID_DIALYSATE_OUT_FLOW_DATA, COMM_BUFFER_OUT_CAN_HD_BROADCAST, (U08*)&dialOutBroadCastVariables, sizeof( DIAL_OUT_FLOW_DATA_T ) );
         dialOutFlowDataPublicationTimerCounter = 0;
Index: firmware/App/Controllers/DialOutFlow.h
===================================================================
diff -u -rff9c8ebdcf0ee2188346cfaa27ff5c2027dcd0a8 -rbb648110d33fb859beed67fabc43f7e9614fc00a
--- firmware/App/Controllers/DialOutFlow.h	(.../DialOutFlow.h)	(revision ff9c8ebdcf0ee2188346cfaa27ff5c2027dcd0a8)
+++ firmware/App/Controllers/DialOutFlow.h	(.../DialOutFlow.h)	(revision bb648110d33fb859beed67fabc43f7e9614fc00a)
@@ -49,6 +49,7 @@
     F32 ufCalcRate;                                 ///< Latest calculated UF rate.
     U32 rotorHall;                                  ///< Latest rotor hall sensor state (1=home, 0=not home)
     F32 currentSetUFRate;                           ///< Latest UF set rate.
+    U32 dialOutPumpState;                           ///< Current state of execution
 } DIAL_OUT_FLOW_DATA_T;
 #pragma pack(pop)
 
Index: firmware/App/Modes/ModeTreatment.c
===================================================================
diff -u -rf47dd3b39499eee03d3e93236335c087b4ad71fb -rbb648110d33fb859beed67fabc43f7e9614fc00a
--- firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision f47dd3b39499eee03d3e93236335c087b4ad71fb)
+++ firmware/App/Modes/ModeTreatment.c	(.../ModeTreatment.c)	(revision bb648110d33fb859beed67fabc43f7e9614fc00a)
@@ -1283,16 +1283,17 @@
             result = TRUE;
             sendTreatmentLogEventData( BLOOD_FLOW_RATE_CHANGE_EVENT, getTreatmentParameterU32( TREATMENT_PARAM_BLOOD_FLOW ), bloodRate );
             sendTreatmentLogEventData( DIALYSATE_FLOW_RATE_CHANGE_EVENT, getTreatmentParameterU32( TREATMENT_PARAM_DIALYSATE_FLOW ), dialRate );
+            // when one of the parameters change from the previous value, then allow to update new rates, otherwise ignore it.
             if ( ( bloodRate != (U32)getTreatmentParameterU32( TREATMENT_PARAM_BLOOD_FLOW ) ) ||
                  ( dialRate != (U32)getTreatmentParameterU32( TREATMENT_PARAM_DIALYSATE_FLOW ) ) )
             {
                 signalInitiatePressureStabilization( USE_NORMAL_STABILIZATION_PERIOD );
+                // Set to new rates
+                setTreatmentParameterU32( TREATMENT_PARAM_BLOOD_FLOW, bloodRate );
+                setTreatmentParameterU32( TREATMENT_PARAM_DIALYSATE_FLOW, dialRate );
+                setDialysisParams( getTreatmentParameterU32( TREATMENT_PARAM_BLOOD_FLOW ), getTreatmentParameterU32( TREATMENT_PARAM_DIALYSATE_FLOW ),
+                                   presMaxUFVolumeML, presUFRate );
             }
-            // Set to new rates
-            setTreatmentParameterU32( TREATMENT_PARAM_BLOOD_FLOW, bloodRate );
-            setTreatmentParameterU32( TREATMENT_PARAM_DIALYSATE_FLOW, dialRate );
-            setDialysisParams( getTreatmentParameterU32( TREATMENT_PARAM_BLOOD_FLOW ), getTreatmentParameterU32( TREATMENT_PARAM_DIALYSATE_FLOW ),
-                               presMaxUFVolumeML, presUFRate );
         }
         else
         {