Index: firmware/App/Modes/ModeChemicalDisinfect.c
===================================================================
diff -u -r75868c86d86060f8ec8fde969a479e186e51d9a0 -r213c09d4f8c37e562611df2539f73ffaea022f83
--- firmware/App/Modes/ModeChemicalDisinfect.c	(.../ModeChemicalDisinfect.c)	(revision 75868c86d86060f8ec8fde969a479e186e51d9a0)
+++ firmware/App/Modes/ModeChemicalDisinfect.c	(.../ModeChemicalDisinfect.c)	(revision 213c09d4f8c37e562611df2539f73ffaea022f83)
@@ -1243,6 +1243,7 @@
         stateTimer       = getMSTimerCount();
         // 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 );
     }