Index: firmware/App/Controllers/BloodFlow.c
===================================================================
diff -u -r563f516a81cb41290008f93b33e7cf5e121717db -rc05775820109b5e83596c58a3b4248ac6cdb1d65
--- firmware/App/Controllers/BloodFlow.c	(.../BloodFlow.c)	(revision 563f516a81cb41290008f93b33e7cf5e121717db)
+++ firmware/App/Controllers/BloodFlow.c	(.../BloodFlow.c)	(revision c05775820109b5e83596c58a3b4248ac6cdb1d65)
@@ -114,6 +114,8 @@
 #define BLOOD_FLOW_FAST_READ_TO_PERSIST     100
 /// Blood flow slow read timeout alarm persistence.
 #define BLOOD_FLOW_SLOW_READ_TO_PERSIST     ( MS_PER_SECOND * 3 )
+/// Blood flow comm error persistence.
+#define BLOOD_FLOW_COMM_ERROR_PERSIST       MS_PER_SECOND
 
 #define BFM_SENSOR_CONNECTED_STATUS         0x00            ///< Blood flow meter connected status.
 #define BFM_SENSOR_PARAM_CORRUPT_STATUS     0x07            ///< Blood flow meter NVM parameter status.
@@ -191,16 +193,17 @@
 static U32 errorBloodPumpDirectionPersistTimerCtr = 0;                          ///< Persistence timer counter for pump direction error condition.
 static U32 errorBloodPumpRotorTooFastPersistTimerCtr = 0;                       ///< Persistence timer counter for pump rotor too fast error condition.
 
-static F32 flowReadings[ SIZE_OF_ROLLING_AVG ];                                 ///< Holds flow samples for a rolling average
-static U32 flowReadingsIdx = 0;                                                 ///< Index for next sample in rolling average array
-static F32 flowReadingsTotal = 0.0;                                             ///< Rolling total - used to calc average
-static U32 flowReadingsCount = 0;                                               ///< Number of samples in flow rolling average buffer
+static F32 flowReadings[ SIZE_OF_ROLLING_AVG ];                                 ///< Holds flow samples for a rolling average.
+static U32 flowReadingsIdx = 0;                                                 ///< Index for next sample in rolling average array.
+static F32 flowReadingsTotal = 0.0;                                             ///< Rolling total - used to calc average.
+static U32 flowReadingsCount = 0;                                               ///< Number of samples in flow rolling average buffer.
 
-static U32 bpCurrErrorDurationCtr = 0;                                          ///< Used for tracking persistence of bp current errors
+static U32 bpCurrErrorDurationCtr = 0;                                          ///< Used for tracking persistence of bp current errors.
 
-static U08 lastBloodFlowFastPacketReadCtr = 0;                                  ///< Previous read counter for the blood flow fast packets
-static U08 lastBloodFlowSlowPacketReadCtr = 0;                                  ///< Previous read counter for the blood flow slow packets
-static U08 lastBloodPumpDirectionCount = 0;                                     ///< Previous pump direction error count reported by FPGA
+static U08 lastBloodFlowFastPacketReadCtr = 0;                                  ///< Previous read counter for the blood flow fast packets.
+static U08 lastBloodFlowSlowPacketReadCtr = 0;                                  ///< Previous read counter for the blood flow slow packets.
+static U08 lastBloodPumpDirectionCount = 0;                                     ///< Previous pump direction error count reported by FPGA.
+static U08 lastBloodFlowCommErrorCount = 0;                                     ///< Previous BP flow sensor comm error count.
 
 // ********** private function prototypes **********
 
@@ -257,6 +260,7 @@
     initPersistentAlarm( ALARM_ID_BLOOD_FLOW_SIGNAL_STRENGTH_TOO_LOW, FLOW_SIG_STRGTH_ALARM_PERSIST, FLOW_SIG_STRGTH_ALARM_PERSIST );
     initPersistentAlarm( ALARM_ID_HD_BP_FLOW_READ_TIMEOUT_ERROR, 0, BLOOD_FLOW_FAST_READ_TO_PERSIST );
     initPersistentAlarm( ALARM_ID_HD_BP_FLOW_SLOW_READ_TIMEOUT_ERROR, 0, BLOOD_FLOW_SLOW_READ_TO_PERSIST );
+    initPersistentAlarm( ALARM_ID_HD_BP_FLOW_SENSOR_ERROR, 0, BLOOD_FLOW_COMM_ERROR_PERSIST );
 }
 
 /*********************************************************************//**
@@ -451,10 +455,15 @@
     U08 flowStatus = getFPGABloodFlowMeterStatus();
 
 #ifndef DISABLE_PUMP_FLOW_CHECKS
+    if ( TRUE == isPersistentAlarmTriggered( ALARM_ID_HD_BP_FLOW_SENSOR_ERROR, ( flowErrorCtr != lastBloodFlowCommErrorCount ) ) )
+    {
+        activateAlarmNoData( ALARM_ID_HD_BP_FLOW_SENSOR_ERROR );
+    }
     if ( flowStatus != BFM_SENSOR_CONNECTED_STATUS )
     {
         SET_ALARM_WITH_1_U32_DATA( ALARM_ID_HD_BLOOD_FLOW_STATUS_SELF_TEST_FAILURE, (U32)flowStatus );
     }
+    lastBloodFlowCommErrorCount = flowErrorCtr;
 #endif
 
 #ifndef DISABLE_FPGA_COUNTER_CHECKS
@@ -501,7 +510,6 @@
     // Publish blood flow data on interval
     publishBloodFlowData();
 }
-//ALARM_ID_HD_BP_FLOW_SENSOR_ERROR = 208,                         ///< HD blood flow sensor error
 
 /*********************************************************************//**
  * @brief