Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -rff0edadf0c6f161a0a092ddaf94d1940d64f7d5e -rd9839070a9c1d8dbc58cbba991b0b6845ee42d59
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision ff0edadf0c6f161a0a092ddaf94d1940d64f7d5e)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision d9839070a9c1d8dbc58cbba991b0b6845ee42d59)
@@ -48,7 +48,7 @@
 
 static BOOL pendingStartDDPreGenRequest;                                                  ///< Flag indicating TD has requested DD start the pre generation dialysate request.
 //static BOOL pendingStartDDFlushRequest;                                                 ///< Flag indicating TD has requested DD start flush.
-//static BOOL pendingStartDDHeatDisinfectRequest;                                         ///< Flag indicating TD has requested DD start heat disinfect.
+BOOL pendingStartDDHeatDisinfectRequest;                                         ///< Flag indicating TD has requested DD start heat disinfect.
 //static BOOL pendingStartDDHeatDisinfectActiveCoolRequest;                               ///< Flag indicating TD has requested DD start heat disinfect active cool.
 //static BOOL pendingStartDGROPermeateSampleRequest;                                      ///< Flag indicating TD has requested DD to command RO to start permeate sample.
 
@@ -185,11 +185,11 @@
 //        pendingStartDDFlushRequest = FALSE;
 //        requestNewOperationMode( DD_MODE_FLUS );
 //    }
-//    else if ( TRUE == pendingStartDDHeatDisinfectRequest )
-//    {
-//        pendingStartDDHeatDisinfectRequest = FALSE;
-//        requestNewOperationMode( DD_MODE_HEAT );
-//    }
+    else if ( TRUE == pendingStartDDHeatDisinfectRequest )
+    {
+        pendingStartDDHeatDisinfectRequest = FALSE;
+        requestNewOperationMode( DD_MODE_HEAT );
+    }
 //    else if ( TRUE == pendingStartDDHeatDisinfectActiveCoolRequest )
 //    {
 //        pendingStartDDHeatDisinfectActiveCoolRequest = FALSE;