Index: firmware/App/Modes/ModeChemicalDisinfect.c
===================================================================
diff -u -r51d67532a86df4c88bebe57d224a9c81c029c08b -r98d81183a0783497cf5717ef34aa5e862136a790
--- firmware/App/Modes/ModeChemicalDisinfect.c	(.../ModeChemicalDisinfect.c)	(revision 51d67532a86df4c88bebe57d224a9c81c029c08b)
+++ firmware/App/Modes/ModeChemicalDisinfect.c	(.../ModeChemicalDisinfect.c)	(revision 98d81183a0783497cf5717ef34aa5e862136a790)
@@ -1120,6 +1120,7 @@
             setValveState( VRI, VALVE_STATE_R1_C_TO_NO );
             setValveState( VRO, VALVE_STATE_R1_C_TO_NO );
             setValveState( VRD2, VALVE_STATE_CLOSED );
+            setValveState( VPD, VALVE_STATE_DRAIN_C_TO_NO );
             turnOffUVReactor( INLET_UV_REACTOR );
             turnOffUVReactor( OUTLET_UV_REACTOR );
             signalROPumpHardStop();