Index: firmware/App/Modes/ModePreTreat.c
===================================================================
diff -u -r125a27d5a3a116e7b7473ff180daf247270d8e57 -r9bc5e72e777b0bf72807428e40450705b1eef321
--- firmware/App/Modes/ModePreTreat.c	(.../ModePreTreat.c)	(revision 125a27d5a3a116e7b7473ff180daf247270d8e57)
+++ firmware/App/Modes/ModePreTreat.c	(.../ModePreTreat.c)	(revision 9bc5e72e777b0bf72807428e40450705b1eef321)
@@ -16,6 +16,7 @@
 ***************************************************************************/
 
 #include "AlarmMgmt.h"
+#include "Buttons.h"
 #include "ConsumableSelfTest.h"
 #include "FPGA.h"
 #include "ModePreTreat.h"
@@ -161,6 +162,13 @@
 *************************************************************************/
 U32 execPreTreatmentMode( void )
 {
+    BOOL stop = isStopButtonPressed();
+
+    if ( TRUE == stop )
+    {
+        activateAlarmNoData( ALARM_ID_TREATMENT_STOPPED_BY_USER );
+    }
+
     // execute mode state machine
     switch ( currentPreTreatmentState )
     {