Index: firmware/App/Modes/ModeTreatmentParams.c
===================================================================
diff -u -r46b163d19c65e8c21db7b0247bbb1af0dba1ece5 -r1f91b5a53bda942b0967817bbd5e68a499dbf816
--- firmware/App/Modes/ModeTreatmentParams.c	(.../ModeTreatmentParams.c)	(revision 46b163d19c65e8c21db7b0247bbb1af0dba1ece5)
+++ firmware/App/Modes/ModeTreatmentParams.c	(.../ModeTreatmentParams.c)	(revision 1f91b5a53bda942b0967817bbd5e68a499dbf816)
@@ -1,14 +1,14 @@
 /**************************************************************************
 *
-* Copyright (c) 2020-2022 Diality Inc. - All Rights Reserved.
+* Copyright (c) 2020-2023 Diality Inc. - All Rights Reserved.
 *
 * 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    ModeTreatmentParams.c
 *
-* @author  (last)      Sean Nash
-* @date    (last)      01-Aug-2022
+* @author  (last)      Michael Garthwaite
+* @date    (last)      19-Jan-2023
 *
 * @author  (original)  Sean Nash
 * @date    (original)  29-May-2020
@@ -276,6 +276,7 @@
  *************************************************************************/
 U32 execTreatParamsMode( void )
 {
+    HD_TREATMENT_PARAMS_MODE_STATE_T priorSubState = currentTreatmentParamsState;
     BOOL stop = isStopButtonPressed();
 
     if ( TRUE == stop )
@@ -304,6 +305,11 @@
 
     }
 
+    if ( priorSubState != currentTreatmentParamsState )
+    {
+        SEND_EVENT_WITH_2_U32_DATA( HD_EVENT_SUB_STATE_CHANGE, priorSubState, currentTreatmentParamsState );
+    }
+
     return (U32)currentTreatmentParamsState;
 }