Index: firmware/App/Controllers/DGInterface.c
===================================================================
diff -u -rc45f78c0ff3b0a866b7f6233092a2e611e801460 -rc25d707f6f5f2463639425e2efd6876bed974304
--- firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision c45f78c0ff3b0a866b7f6233092a2e611e801460)
+++ firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision c25d707f6f5f2463639425e2efd6876bed974304)
@@ -49,7 +49,6 @@
 #define DIALYSATE_TEMP_LOW_SAFETY_LIMIT_C        42.0F                       ///< Dialysate low safety temperature limit in C.
 #define DIALYSATE_TEMP_LOW_SAFETY_TIMEOUT_MS     ( 10 * MS_PER_SECOND )      ///< Dialysate temperature low safety timeout in milliseconds.
 #define DG_DATA_FRESHNESS_TIMEOUT_MS             ( 3 * MS_PER_SECOND )       ///< DG data freshness timeout (in ms).
-#define DIALYSATE_FLOW_FRESHNESS_TIMEOUT_MS      ( 300 * MS_PER_SECOND )     ///< Dialysate flow freshness timeout (in ms). // DN-31OCT2022
 
 // ********** private data **********
 
@@ -185,7 +184,6 @@
     initPersistentAlarm( ALARM_ID_HD_NEW_DIALYSATE_TEMPERATURE_DATA_MESSAGE_NOT_RECEIVE, DG_DATA_FRESHNESS_TIMEOUT_MS, DG_DATA_FRESHNESS_TIMEOUT_MS );
     initPersistentAlarm( ALARM_ID_HD_NEW_RESERVOIRS_DATA_MESSAGE_NOT_RECEIVE, DG_DATA_FRESHNESS_TIMEOUT_MS, DG_DATA_FRESHNESS_TIMEOUT_MS );
     initPersistentAlarm( ALARM_ID_HD_NEW_DG_OPERATION_MODE_MESSAGE_NOT_RECEIVE, DG_DATA_FRESHNESS_TIMEOUT_MS, DG_DATA_FRESHNESS_TIMEOUT_MS );
-    initPersistentAlarm( ALARM_ID_HD_DIAL_IN_FLOW_CHECK_FAILURE, DIALYSATE_FLOW_FRESHNESS_TIMEOUT_MS, DIALYSATE_FLOW_FRESHNESS_TIMEOUT_MS ); // DN-31OCT2022
 }
 
 /**********************************************************************//**
@@ -242,9 +240,6 @@
     // Trigger alarm if not receiving new DG op mode message in timely manner
     checkDGDataFreshness( ALARM_ID_HD_NEW_DG_OPERATION_MODE_MESSAGE_NOT_RECEIVE, &dgOpModeDataFreshFlag );
 
-    // Trigger alarm if not receiving new DG op mode message in timely manner
-    //checkDGDataFreshness( ALARM_ID_HD_DIAL_IN_FLOW_CHECK_FAILURE, &dgDialysateFlowDataFreshFlag ); // DN-31OCT2022 - TODO: Will remove this line???
-
     // Check to see if DG has restarted
     checkDGRestart();
 }
Index: firmware/App/Controllers/DialInFlow.c
===================================================================
diff -u -rd0c3528f9ce49e8f24176de6bd49f4b5088e78b8 -rc25d707f6f5f2463639425e2efd6876bed974304
--- firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision d0c3528f9ce49e8f24176de6bd49f4b5088e78b8)
+++ firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision c25d707f6f5f2463639425e2efd6876bed974304)
@@ -275,6 +275,7 @@
 
     // Initialize persistent alarm for flow sensor signal strength too low
     initPersistentAlarm( ALARM_ID_HD_DIAL_IN_FLOW_OUT_OF_RANGE, 0, DIP_MAX_FLOW_RATE_OUT_OF_RANGE_PERSIST );
+    initPersistentAlarm( ALARM_ID_HD_DIAL_IN_FLOW_CHECK_FAILURE, DIP_FLOW_VS_SPEED_PERSIST, DIP_FLOW_VS_SPEED_PERSIST );
     initTimeWindowedCount( TIME_WINDOWED_COUNT_DIP_COMMUTATION_ERROR, DIP_COMMUTATION_ERROR_MAX_CNT, DIP_COMMUTATION_ERROR_TIME_WIN_MS );
 }
 
@@ -806,34 +807,27 @@
 
         if ( ( QdTarget < DIAL_IN_FLOW_QHIGHTRANSITION ) && ( QdTarget > DIAL_IN_FLOW_QLOWTRANSITION ) )
         {   // use blended flow rate calculation
-            estimatedFlow = ( ( QdTarget - DIAL_IN_FLOW_QLOWTRANSITION ) / ( DIAL_IN_FLOW_QHIGHTRANSITION - DIAL_IN_FLOW_QLOWTRANSITION ) ) * calculatedFlow +
-                            ( ( DIAL_IN_FLOW_QHIGHTRANSITION - QdTarget ) / ( DIAL_IN_FLOW_QHIGHTRANSITION - DIAL_IN_FLOW_QLOWTRANSITION ) ) * filteredDialInFlowMeterReading;
+            estimatedFlow = ( ( QdTarget - DIAL_IN_FLOW_QLOWTRANSITION ) / ( DIAL_IN_FLOW_QHIGHTRANSITION - DIAL_IN_FLOW_QLOWTRANSITION ) ) * filteredDialInFlowMeterReading +
+                            ( ( DIAL_IN_FLOW_QHIGHTRANSITION - QdTarget ) / ( DIAL_IN_FLOW_QHIGHTRANSITION - DIAL_IN_FLOW_QLOWTRANSITION ) ) * calculatedFlow;
         }
         else
-        {
-            if ( QdTarget > DIAL_IN_FLOW_QHIGHTRANSITION)
-            {
-                estimatedFlow = filteredDialInFlowMeterReading; // Use flow sensor
-            }
-            else
-            {
-                estimatedFlow = calculatedFlow;  // use calculated flow rate.
-            }
+        {   // use calculated flow rate.  Assume target flow rate has  already checked for out of bounds on low end.
+            estimatedFlow = calculatedFlow;
         }
     }
 
     // Check the measured flow against estimated flow - /
     deltaFlow = 0.5 * estimatedFlow;    // 50% estimated flow
-    if ( TRUE == isDialInPumpRunning() )
+    if ( ( TRUE == isDialInPumpRunning() ) && ( dialInPumpControlMode != PUMP_CONTROL_MODE_OPEN_LOOP ) )
     {
-           if ( ( TRUE == isPersistentAlarmTriggered( ALARM_ID_HD_DIAL_IN_FLOW_CHECK_FAILURE, deltaFlow < fabs( estimatedFlow - filteredDialInFlowMeterReading ) ) ) )
-           {
-               SET_ALARM_WITH_2_F32_DATA( ALARM_ID_HD_DIAL_IN_FLOW_CHECK_FAILURE, filteredDialInFlowMeterReading, estimatedFlow );
-           }
+        if ( ( TRUE == isPersistentAlarmTriggered( ALARM_ID_HD_DIAL_IN_FLOW_CHECK_FAILURE, deltaFlow < fabs( estimatedFlow - filteredDialInFlowMeterReading ) ) ) )
+        {
+            SET_ALARM_WITH_2_F32_DATA( ALARM_ID_HD_DIAL_IN_FLOW_CHECK_FAILURE, filteredDialInFlowMeterReading, estimatedFlow );
+        }
     }
     else
     {
-           isPersistentAlarmTriggered( ALARM_ID_HD_DIAL_IN_FLOW_CHECK_FAILURE, FALSE );
+        isPersistentAlarmTriggered( ALARM_ID_HD_DIAL_IN_FLOW_CHECK_FAILURE, FALSE );
     }
 
     return estimatedFlow;