Index: firmware/App/Modes/ModeChemicalDisinfectFlush.c
===================================================================
diff -u -r8ebab816fadec93b2f3c6a42f15a07c26b3a4f59 -r213c09d4f8c37e562611df2539f73ffaea022f83
--- firmware/App/Modes/ModeChemicalDisinfectFlush.c	(.../ModeChemicalDisinfectFlush.c)	(revision 8ebab816fadec93b2f3c6a42f15a07c26b3a4f59)
+++ firmware/App/Modes/ModeChemicalDisinfectFlush.c	(.../ModeChemicalDisinfectFlush.c)	(revision 213c09d4f8c37e562611df2539f73ffaea022f83)
@@ -800,6 +800,7 @@
 
         // The drain is set to start from reservoir 2
         setValveState( VRD2, VALVE_STATE_OPEN );
+        setValveState( VPO, VALVE_STATE_FILL_C_TO_NC );
         setDrainPumpTargetRPM( DRAIN_PUMP_TARGET_RPM );
 
         // Start the timer for drain timeout