Index: firmware/App/Modes/PreTreatmentRecirc.c
===================================================================
diff -u -r0a4dcd288d4347b85baaa0b07da568b6add5eac7 -r82b7c4c94b0f8b3f8a3d3d2e41384a7a7d497215
--- firmware/App/Modes/PreTreatmentRecirc.c	(.../PreTreatmentRecirc.c)	(revision 0a4dcd288d4347b85baaa0b07da568b6add5eac7)
+++ firmware/App/Modes/PreTreatmentRecirc.c	(.../PreTreatmentRecirc.c)	(revision 82b7c4c94b0f8b3f8a3d3d2e41384a7a7d497215)
@@ -85,6 +85,8 @@
  *************************************************************************/
 void execPreTreatmentRecirc( void )
 {
+    HD_PRE_TREATMENT_RECIRC_STATE_T priorSubState = currentPreTreatmentRecircState;
+
     // execute pre-treatment recirculate state machine
     switch ( currentPreTreatmentRecircState )
     {
@@ -101,6 +103,10 @@
             break;
     }
 
+    if ( priorSubState != currentPreTreatmentRecircState )
+    {
+        SEND_EVENT_WITH_2_U32_DATA( HD_EVENT_SUB_STATE_CHANGE, priorSubState, currentPreTreatmentRecircState );
+    }
     // All flags should be handled by now, reset in case flags not handle in current state
     resetPreTreatmentRecircFlags();
 }