Index: firmware/App/Modes/PreTreatmentRecirc.c
===================================================================
diff -u -r0a4dcd288d4347b85baaa0b07da568b6add5eac7 -r5d9c5362b537331248dc592e05b6b016267eb6d3
--- firmware/App/Modes/PreTreatmentRecirc.c	(.../PreTreatmentRecirc.c)	(revision 0a4dcd288d4347b85baaa0b07da568b6add5eac7)
+++ firmware/App/Modes/PreTreatmentRecirc.c	(.../PreTreatmentRecirc.c)	(revision 5d9c5362b537331248dc592e05b6b016267eb6d3)
@@ -22,6 +22,7 @@
 #include "DGInterface.h"
 #include "PreTreatmentRecirc.h"
 #include "Switches.h"
+#include "Timers.h"
 #include "Valves.h"
 
 /**
@@ -32,13 +33,18 @@
 // ********** private definitions **********
 
 #define BLOOD_PUMP_RECIRC_FLOW_RATE                         100                 ///< Blood pump flow rate during recirculation in mL/min.
-/// TODO: Restore to 100 when DPi flow control is fixed.
+// TODO: Restore to 100 when DPi flow control is fixed.
 #define DIALYSATE_PUMP_RECIRC_FLOW_RATE                     250                 ///< Dialysate pump flow rate during recirculation in mL/min.
+#define WARNING_MEDIUM_PRIME_COMPLETED_TIME_MS     ( 90 * 60 * MS_PER_SECOND )  ///< Pre-Treatment recirc time before medium priority warning in min.
+#define WARNING_HIGH_PRIME_COMPLETED_TIME_MS      ( 120 * 60 * MS_PER_SECOND )  ///< Pre-Treatment recirc time before high priority alarm in min.
 
 // ********** private data **********
 
 static HD_PRE_TREATMENT_RECIRC_STATE_T currentPreTreatmentRecircState;          ///< Current state of the pre-treatment recirculate state machine.
 static BOOL recircResumeRequested;                                              ///< Flag indicates alarm requesting to resume pre-treatment recirculate.
+static U32  preTxRecircStartTime;                                               ///< Time pre-treatment re-circulate state started.
+static BOOL recircTOWarningGiven;                                               ///< Flag indicates 90 minute warning given.
+static BOOL recircTOAlarmGiven;                                                 ///< Flag indicates 2 hour alarm triggered.
 
 // ********** private function prototypes **********
 
@@ -58,6 +64,9 @@
 void initPreTreatmentRecirc( void )
 {
     currentPreTreatmentRecircState = PRE_TREATMENT_RECIRC_STATE;
+    preTxRecircStartTime = getMSTimerCount();
+    recircTOWarningGiven = FALSE;
+    recircTOAlarmGiven = FALSE;
 
     resetPreTreatmentRecircFlags();
 }
@@ -85,6 +94,14 @@
  *************************************************************************/
 void execPreTreatmentRecirc( void )
 {
+    // Alarm if 2 hours recirculating
+    if ( ( recircTOAlarmGiven != TRUE ) && ( TRUE == didTimeout( preTxRecircStartTime, WARNING_HIGH_PRIME_COMPLETED_TIME_MS ) ) )
+    {
+        recircTOAlarmGiven = TRUE;
+        clearAlarm( ALARM_ID_PRIME_COMPLETED_MEDIUM );
+        activateAlarmNoData( ALARM_ID_PRIME_COMPLETED_HIGH );
+    }
+
     // execute pre-treatment recirculate state machine
     switch ( currentPreTreatmentRecircState )
     {
@@ -187,6 +204,14 @@
 {
     HD_PRE_TREATMENT_RECIRC_STATE_T state = PRE_TREATMENT_RECIRC_STATE;
 
+    // Warn user if 90 minutes recirculating
+    if ( ( recircTOWarningGiven != TRUE ) && ( TRUE == didTimeout( preTxRecircStartTime, WARNING_MEDIUM_PRIME_COMPLETED_TIME_MS ) ) )
+    {
+        recircTOWarningGiven = TRUE;
+        clearAlarm( ALARM_ID_PRIME_COMPLETED_LOW_PRIORITY );
+        activateAlarmNoData( ALARM_ID_PRIME_COMPLETED_MEDIUM );
+    }
+
     if ( TRUE == doesAlarmStatusIndicateStop() )
     {
         signalDialOutPumpHardStop();