Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r85339f0aa398217143fa3178a05ad5d6c6374bb8 -ra3916397312e1dc73efe99d6b3569b7387a9419b
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 85339f0aa398217143fa3178a05ad5d6c6374bb8)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision a3916397312e1dc73efe99d6b3569b7387a9419b)
@@ -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 );