Index: firmware/App/Controllers/DialOutFlow.c
===================================================================
diff -u -rc4117345916148c4f48a0a83831204201444dc99 -rb1492eff71eab83d55456ad3520ccfd6cda06a77
--- firmware/App/Controllers/DialOutFlow.c	(.../DialOutFlow.c)	(revision c4117345916148c4f48a0a83831204201444dc99)
+++ firmware/App/Controllers/DialOutFlow.c	(.../DialOutFlow.c)	(revision b1492eff71eab83d55456ad3520ccfd6cda06a77)
@@ -111,6 +111,8 @@
 
 #define PUMP_DIR_ERROR_COUNT_MASK                0x3F           ///< Bit mask for pump direction error counter.
 #define DOP_MIN_DIR_CHECK_SPEED_RPM              10.0F          ///< Minimum motor speed before we check pump direction.
+#define DOP_COMMUTATION_ERROR_MAX_CNT            3              ///< Maximum number of commutation errors within time window before alarm triggered.
+#define DOP_COMMUTATION_ERROR_TIME_WIN_MS        (15 * MS_PER_SECOND)    ///< Time window for DPo commutation error.
 #define DATA_PUBLISH_COUNTER_START_COUNT         40             ///< Data publish counter start count.
 
 /// Enumeration of dialysate outlet pump controller states.
@@ -242,6 +244,8 @@
     ufMeasuredRate = 0.0;
     dopRateCorrectionOffset = 0.0;
     resetDialOutFlowMovingAverage();
+
+    initTimeWindowedCount( TIME_WINDOWED_COUNT_DOP_COMMUTATION_ERROR, DOP_COMMUTATION_ERROR_MAX_CNT, DOP_COMMUTATION_ERROR_TIME_WIN_MS );
 }
 
 /*********************************************************************//**
@@ -942,7 +946,7 @@
         BOOL isHallSensorFailed = ( TRUE == minDirSpeed && lastDialOutPumpDirectionCount != dirErrorCnt ? TRUE : FALSE );
 
         // Check pump direction error count
-        if ( TRUE == isPersistentAlarmTriggered( ALARM_ID_HD_PUMP_DIRECTION_STATUS_ERROR, isHallSensorFailed ) )
+        if ( ( TRUE == isHallSensorFailed ) && ( TRUE == incTimeWindowedCount( TIME_WINDOWED_COUNT_DOP_COMMUTATION_ERROR ) ) )
         {
 #ifndef _RELEASE_
             if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_PUMP_DIRECTION_CHECKS ) != SW_CONFIG_ENABLE_VALUE )