Index: firmware/App/Services/AlarmMgmt.c
===================================================================
diff -u -r9864b14f76782f1e68bf266dcd843451748715a0 -rfef7e8ec54aea7e7dc447b6240796013cc086604
--- firmware/App/Services/AlarmMgmt.c	(.../AlarmMgmt.c)	(revision 9864b14f76782f1e68bf266dcd843451748715a0)
+++ firmware/App/Services/AlarmMgmt.c	(.../AlarmMgmt.c)	(revision fef7e8ec54aea7e7dc447b6240796013cc086604)
@@ -52,7 +52,7 @@
 #pragma pack(pop)
 
 const ALARM_T alarmTable[ NUM_OF_ALARM_IDS ] =
-{ //     Priority           Esc                 Escalate To                                Fault  Stops  NoClr  NoRes  NoRin  NoEnd  NoNew  Bypass
+{ //     Priority            Escalate In        Escalate To                                Fault  Stops  NoClr  NoRes  NoRin  NoEnd  NoNew  Bypass
     { ALARM_PRIORITY_NONE,   0,              ALARM_ID_NO_ALARM,                            FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE }, // ALARM_ID_NO_ALARM
     { ALARM_PRIORITY_HIGH,   0,              ALARM_ID_NO_ALARM,                            TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , FALSE }, // ALARM_ID_SOFTWARE_FAULT
     { ALARM_PRIORITY_HIGH,   0,              ALARM_ID_NO_ALARM,                            TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , FALSE }, // ALARM_ID_STUCK_BUTTON_TEST_FAILED
@@ -76,11 +76,12 @@
     { ALARM_PRIORITY_HIGH,   0,              ALARM_ID_NO_ALARM,                            TRUE,  TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , FALSE }, // ALARM_ID_RTC_CONFIG_ERROR
     { ALARM_PRIORITY_HIGH,   0,              ALARM_ID_NO_ALARM,                            TRUE,  TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , FALSE }, // ALARM_ID_DG_COMM_TIMEOUT
     { ALARM_PRIORITY_HIGH,   0,              ALARM_ID_NO_ALARM,                            TRUE,  TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , FALSE }, // ALARM_ID_UI_COMM_TIMEOUT
-    { ALARM_PRIORITY_HIGH,   ALM_ESC_4_MIN,  ALARM_ID_BLOOD_SITTING_WARNING,               TRUE,  TRUE , TRUE,  TRUE,  TRUE,  TRUE,  TRUE,  FALSE }, // ALARM_ID_COMM_TOO_MANY_BAD_CRCS
+    { ALARM_PRIORITY_HIGH,   0,              ALARM_ID_BLOOD_SITTING_WARNING,               TRUE,  TRUE , TRUE,  TRUE,  TRUE,  TRUE,  TRUE,  FALSE }, // ALARM_ID_COMM_TOO_MANY_BAD_CRCS
     { ALARM_PRIORITY_LOW,    ALM_ESC_4_MIN,  ALARM_ID_BLOOD_SITTING_WARNING,               FALSE, TRUE , FALSE, FALSE, FALSE, FALSE, FALSE, FALSE }, // ALARM_ID_TREATMENT_STOPPED_BY_USER
     { ALARM_PRIORITY_MEDIUM, ALM_ESC_1_MIN,  ALARM_ID_BLOOD_SITTING_TOO_LONG_NO_RESUME,    FALSE, TRUE , FALSE, FALSE, FALSE, FALSE, FALSE, FALSE }, // ALARM_ID_BLOOD_SITTING_WARNING
     { ALARM_PRIORITY_MEDIUM, ALM_ESC_5_MIN,  ALARM_ID_BLOOD_SITTING_TOO_LONG_NO_RINSEBACK, FALSE, TRUE , FALSE, TRUE,  FALSE, FALSE, FALSE, FALSE }, // ALARM_ID_BLOOD_SITTING_TOO_LONG_NO_RESUME
     { ALARM_PRIORITY_HIGH,   0,              ALARM_ID_NO_ALARM,                            FALSE, TRUE , FALSE, TRUE,  TRUE,  FALSE, FALSE, FALSE }, // ALARM_ID_BLOOD_SITTING_TOO_LONG_NO_RINSEBACK
+    { ALARM_PRIORITY_HIGH,   0,              ALARM_ID_BLOOD_SITTING_WARNING,               TRUE,  TRUE , TRUE,  TRUE,  TRUE,  TRUE,  TRUE,  FALSE }, // ALARM_ID_CAN_MESSAGE_NOT_ACKED
 };
 
 const ALARM_DATA_T blankAlarmData = { ALARM_DATA_TYPE_NONE, 0 };
Index: firmware/App/Services/AlarmMgmt.h
===================================================================
diff -u -r9864b14f76782f1e68bf266dcd843451748715a0 -rfef7e8ec54aea7e7dc447b6240796013cc086604
--- firmware/App/Services/AlarmMgmt.h	(.../AlarmMgmt.h)	(revision 9864b14f76782f1e68bf266dcd843451748715a0)
+++ firmware/App/Services/AlarmMgmt.h	(.../AlarmMgmt.h)	(revision fef7e8ec54aea7e7dc447b6240796013cc086604)
@@ -49,6 +49,7 @@
     ALARM_ID_BLOOD_SITTING_WARNING,                     // 25
     ALARM_ID_BLOOD_SITTING_TOO_LONG_NO_RESUME,
     ALARM_ID_BLOOD_SITTING_TOO_LONG_NO_RINSEBACK,
+    ALARM_ID_CAN_MESSAGE_NOT_ACKED,
     NUM_OF_ALARM_IDS
 } ALARM_ID_T;
 
Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -r9864b14f76782f1e68bf266dcd843451748715a0 -rfef7e8ec54aea7e7dc447b6240796013cc086604
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 9864b14f76782f1e68bf266dcd843451748715a0)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision fef7e8ec54aea7e7dc447b6240796013cc086604)
@@ -957,7 +957,10 @@
             }
             else
             {
-                // TODO - fault
+                U16 msgID;
+
+                memcpy( &msgID, &pendingAckList[ i ].msg[ sizeof( U08 ) + sizeof( U16) ], sizeof( U16 ) );
+                SET_ALARM_WITH_1_U32_DATA( ALARM_ID_CAN_MESSAGE_NOT_ACKED, (U32)msgID );
             }
         }
     }
Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r9864b14f76782f1e68bf266dcd843451748715a0 -rfef7e8ec54aea7e7dc447b6240796013cc086604
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 9864b14f76782f1e68bf266dcd843451748715a0)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision fef7e8ec54aea7e7dc447b6240796013cc086604)
@@ -101,9 +101,10 @@
 
     // set sequence # and ACK bit
 #ifdef ACK_IMPLEMENTED
+    // thread protect next sequence # access & increment
     _disable_IRQ();
-    msg.hdr.seqNo = nextSeqNo;
-    nextSeqNo = INC_WRAP( nextSeqNo, MIN_MSG_SEQ_NO, MAX_MSG_SEQ_NO );
+        msg.hdr.seqNo = nextSeqNo;
+        nextSeqNo = INC_WRAP( nextSeqNo, MIN_MSG_SEQ_NO, MAX_MSG_SEQ_NO );
     _enable_IRQ();
     if ( TRUE == ackReq )
     {