Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r686acb428a08c632526ca35c8a0102ab22836bd0 -ra3916397312e1dc73efe99d6b3569b7387a9419b
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 686acb428a08c632526ca35c8a0102ab22836bd0)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision a3916397312e1dc73efe99d6b3569b7387a9419b)
@@ -502,7 +502,7 @@
     }
 
     // serialize the message (w/ sync, CRC, and appropriate CAN padding) and add serialized message data to appropriate comm buffer
-    serializeMessage( msg, COMM_BUFFER_OUT_CAN_DG_BROADCAST, ACK_NOT_REQUIRED );
+    serializeMessage( msg, COMM_BUFFER_OUT_CAN_DG_BROADCAST, ACK_REQUIRED );
 }
 
 /*********************************************************************//**
@@ -4414,11 +4414,6 @@
                 requestNewOperationMode( DG_MODE_HEAT );
                 break;
 
-            case NELSON_POS_CONTROL_CHEM_DISINFECT:
-                setChemNelsonSupportMode( nelson );
-                requestNewOperationMode( DG_MODE_CHEM );
-                break;
-
             case NELSON_POS_CONTROL_HEAT_DISINFECT:
                 setHeatNelsonSupportMode( nelson );
                 requestNewOperationMode( DG_MODE_HEAT );