Index: firmware/App/Modes/TreatmentEnd.c
===================================================================
diff -u -r44a100f8e5210a02c23b8fcc4527d8e96d577381 -rccfd15568f1e3d304320c2babb2fd4bcf0413304
--- firmware/App/Modes/TreatmentEnd.c	(.../TreatmentEnd.c)	(revision 44a100f8e5210a02c23b8fcc4527d8e96d577381)
+++ firmware/App/Modes/TreatmentEnd.c	(.../TreatmentEnd.c)	(revision ccfd15568f1e3d304320c2babb2fd4bcf0413304)
@@ -5,13 +5,13 @@
 * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
 * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
 *
-* @file TreatmentEnd.c
+* @file    TreatmentEnd.c
 *
-* @author (last) Sean Nash
-* @date (last) 04-Feb-2021
+* @author  (last)      Sean Nash
+* @date    (last)      19-Aug-2021
 *
-* @author (original) Sean
-* @date (original) 04-Feb-2021
+* @author  (original)  Sean Nash
+* @date    (original)  05-Feb-2021
 *
 ***************************************************************************/
 
@@ -39,8 +39,10 @@
 /// Max time to wait for user to initiate final rinseback.
 static const U32 TX_END_TIMEOUT_MS      = ( ( 15 * 60 * MS_PER_SECOND ) / TASK_GENERAL_INTERVAL );  // TODO - get time from Systems
 
-/// Maximum time in this mode before blood sitting warning given (in general task intervals).
+/// Maximum time in this mode before blood sitting alarm given (in general task intervals).
 static const U32 MAX_TIME_BLOOD_SITTING = ( ( 5 * SEC_PER_MIN * MS_PER_SECOND ) / TASK_GENERAL_INTERVAL );
+/// Maximum time in this mode before blood sitting warning given (in general task intervals).
+static const U32 WARN_TIME_BLOOD_SITTING = ( ( 4 * SEC_PER_MIN * MS_PER_SECOND ) / TASK_GENERAL_INTERVAL );
 
 // ********** private data **********
 
@@ -275,8 +277,13 @@
     else
     {
         // Ensure we do not sit in stopped state for too long
+        if ( bloodSittingTimerCtr > WARN_TIME_BLOOD_SITTING )
+        {
+            activateAlarmNoData( ALARM_ID_BLOOD_SITTING_WARNING );
+        }
         if ( bloodSittingTimerCtr > MAX_TIME_BLOOD_SITTING )
         {
+            // Raise the alarm
             activateAlarmNoData( ALARM_ID_TREATMENT_STOPPED_NO_RINSEBACK );
         }
     }