Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -rd48e02f028dbd430bedda41be0173fbfc45116d7 -r5d3e28c19ae10a99a5ce1fc5c010ac944975a6a1
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision d48e02f028dbd430bedda41be0173fbfc45116d7)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 5d3e28c19ae10a99a5ce1fc5c010ac944975a6a1)
@@ -27,9 +27,12 @@
 #include "FlowSensors.h"
 #include "FPGA.h"
 #include "Heaters.h"
+#include "ModeChemicalDisinfect.h"
 #include "ModeFill.h"
 #include "ModeFlush.h"
 #include "ModeGenIdle.h"
+#include "ModeHeatDisinfect.h"
+#include "ModeHeatDisinfectActiveCool.h"
 #include "ModeInitPOST.h"
 #include "ModeStandby.h"
 #include "MsgQueues.h"
@@ -1557,7 +1560,39 @@
     sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_DG_2_UI, result );
 }
 
+/*************************************************************************
+ * @brief
+ * The handleStartStopDGHeatDisinfectActiveCool function handles a request
+ * start or stop DG heat disinfect active cool mode.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message: a pointer to the message to handle
+ * @return result
+ *************************************************************************/
+void handleStartStopDGHeatDisinfectActiveCool( MESSAGE_T* message )
+{
+    BOOL status = FALSE;
 
+    if ( message->hdr.payloadLen == sizeof(U32) )
+    {
+        BOOL startingDGHeatDisinfectActiveCool;
+
+        memcpy( &startingDGHeatDisinfectActiveCool, message->payload, sizeof(U32) );
+
+        if ( TRUE == startingDGHeatDisinfectActiveCool )
+        {
+            status = startDGHeatDisinfectActiveCool();
+        }
+        else
+        {
+            status = stopDGHeatDisinfectActiveCool();
+        }
+    }
+
+    sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_DG_2_HD, status );
+}
+
+
 // ***********************************************************************
 // **************** Message Handling Helper Functions ********************
 // ***********************************************************************