Index: firmware/App/Modes/ModeFlush.c
===================================================================
diff -u -raf83481e7313ed6b624e1a8ed8996a906177ad6d -r2c4dfa08ac8ead07939b4f6aba3b0073e0997706
--- firmware/App/Modes/ModeFlush.c	(.../ModeFlush.c)	(revision af83481e7313ed6b624e1a8ed8996a906177ad6d)
+++ firmware/App/Modes/ModeFlush.c	(.../ModeFlush.c)	(revision 2c4dfa08ac8ead07939b4f6aba3b0073e0997706)
@@ -402,6 +402,10 @@
              setValveState( VDR, VALVE_STATE_DRAIN_C_TO_NO );
              setROPumpTargetFlowRate( FINAL_DRAIN_RO_PUMP_FLOW_LPM, RO_PUMP_MAX_PRESSURE_PSI );
 
+             // Turn on the UV reactors
+             turnOnUVReactor( INLET_UV_REACTOR );
+             turnOnUVReactor( OUTLET_UV_REACTOR );
+
              flushUIState = FLUSH_UI_STATE_FLUSH_RECIRCULATION_PATH;
              state = DG_FLUSH_STATE_FLUSH_CIRCULATION_DRAIN_LINE;
          }
@@ -643,8 +647,14 @@
         {
             signalROPumpHardStop();
             setValveState( VRD1, VALVE_STATE_OPEN );
+            setValveState( VRO, VALVE_STATE_R1_C_TO_NO );
             setDrainPumpTargetRPM( DRAIN_PUMP_TARGET_RPM );
 
+            // Turn off the UV reactors prior to transitioning to drain states.
+            // In the drain states, there is not fluid flowing in the RO section so the reactors are turned off
+            turnOffUVReactor( INLET_UV_REACTOR );
+            turnOffUVReactor( OUTLET_UV_REACTOR );
+
             stateTimerStart = getMSTimerCount();
             isThisInitialDrain = FALSE;
             rsrvr1Status = DG_RESERVOIR_ABOVE_TARGET;