Index: firmware/App/Services/AlarmMgmt.c
===================================================================
diff -u -rb8d74fc5b07d0e62d841b4c5a786b2be4e593c63 -r565ed0856be2fcf1443e3ec4cb8fe023b2c14db4
--- firmware/App/Services/AlarmMgmt.c	(.../AlarmMgmt.c)	(revision b8d74fc5b07d0e62d841b4c5a786b2be4e593c63)
+++ firmware/App/Services/AlarmMgmt.c	(.../AlarmMgmt.c)	(revision 565ed0856be2fcf1443e3ec4cb8fe023b2c14db4)
@@ -34,10 +34,9 @@
 // ********** private definitions **********
 
 /// Interval to control lamp and audio and to publish alarm status data.
-#define ALARM_STATUS_PUBLISH_INTERVAL           ( ALARM_LAMP_AND_AUDIO_CONTROL_INTERVAL_MS / TASK_GENERAL_INTERVAL )
+static const U32 ALARM_STATUS_PUBLISH_INTERVAL = ( ALARM_LAMP_AND_AUDIO_CONTROL_INTERVAL_MS / TASK_GENERAL_INTERVAL );
 
 #define ALARM_SILENCE_EXPIRES_IN_SECS           (60)                                ///< Alarm silence expiration time in seconds.
-#define ALARM_SILENCE_REQUESTED                 1                                   ///< User cmd to request alarm silence (1=silence, 0=cancel silence).
 
 #define SUPERVISOR_ALARM_KEY                    0xD2C3B4A5                          ///< 32-bit key required for clear all alarms request.
 
@@ -148,7 +147,8 @@
     alarmStatus.noResume = FALSE;
     alarmStatus.noRinseback = FALSE;
     alarmStatus.noEndTreatment = FALSE;
-    alarmStatus.noNewTreatment = FALSE;
+    alarmStatus.noNewTreatment = FALSE;
+    alarmStatus.noDialRecirc = FALSE;
     alarmStatus.usrACKRequired = FALSE;
 }
 
@@ -193,7 +193,12 @@
     {
         // No need to do anything if alarm is already active
         if ( FALSE == alarmIsActive[ alarm ] )
-        {
+        {
+            // If alarm status was that no alarms currently active, set this alarm as top alarm until status formally updated later
+            if ( ALARM_ID_NO_ALARM == alarmStatus.alarmTop )
+            {
+                alarmStatus.alarmTop = alarm;
+            }
             // If alarms silenced, end silence due to new alarm
             alarmStatus.alarmsSilenced = FALSE;
             // If alarm is a fault, request transition to fault mode
@@ -428,9 +433,9 @@
  * @param cmd ID of user command (1=silence, 0=cancel silence)
  * @return none
  *************************************************************************/
-void signalAlarmSilence( U32 cmd )
+void signalAlarmSilence( ALARM_SILENCE_CMD_T cmd )
 {
-    if ( ALARM_SILENCE_REQUESTED == cmd )
+    if ( ALARM_SILENCE_CMD_START == cmd )
     {
         if ( FALSE == alarmStatus.alarmsSilenced )
         {
@@ -543,6 +548,19 @@
 
 /*********************************************************************//**
  * @brief
+ * The isDialysateRecircBlocked function determines whether any currently
+ * active alarm is blocking dialysate re-circulation.
+ * @details Inputs: alarmStatus
+ * @details Outputs: none
+ * @return TRUE if any active alarm prevents dialysate re-circulation, FALSE if not
+ *************************************************************************/
+BOOL isDialysateRecircBlocked( void )
+{
+    return alarmStatus.noDialRecirc;
+}
+
+/*********************************************************************//**
+ * @brief
  * The doesAlarmStatusIndicateStop function determines whether any currently
  * active alarm has stop property.
  * @details Inputs: alarmStatus
@@ -642,7 +660,8 @@
 {
     ALARM_PRIORITY_T highestPriority = ALARM_PRIORITY_NONE;
     ALARM_ID_T a;
-    BOOL faultsActive = FALSE;
+    BOOL faultsActive = FALSE;
+    BOOL dialysateRecircBlocked = FALSE;
 
     // Update FIFOs and sub-ranks per active alarms table - for alarm ranking purposes to determine "top" alarm
     for ( a = ALARM_ID_NO_ALARM; a < NUM_OF_ALARM_IDS; a++ )
@@ -680,14 +699,20 @@
             if ( TRUE == ALARM_TABLE[ a ].alarmIsFault )
             {
                 faultsActive = TRUE;
+            }
+            // Track whether any active alarms prevent dialysate re-circulation so far
+            if ( TRUE == ALARM_TABLE[ a ].alarmNoDialysateRecirc )
+            {
+                dialysateRecircBlocked = TRUE;
             }
         }
     }
 
     // Update alarm to display per highest priority FIFO
     alarmStatus.alarmsState = highestPriority;
     alarmStatus.alarmTop = alarmPriorityFIFO[ highestPriority ].alarmID;
-    alarmStatus.systemFault = faultsActive;
+    alarmStatus.systemFault = faultsActive;
+    alarmStatus.noDialRecirc = dialysateRecircBlocked;
 }
 
 /*********************************************************************//**