Index: firmware/App/Controllers/AirTrap.c
===================================================================
diff -u -r18bc9ae45ec3e7c6961ce81cf565699a10362d2c -r7f9a671cd9eda61054e3b686b59ca81ee02ef925
--- firmware/App/Controllers/AirTrap.c	(.../AirTrap.c)	(revision 18bc9ae45ec3e7c6961ce81cf565699a10362d2c)
+++ firmware/App/Controllers/AirTrap.c	(.../AirTrap.c)	(revision 7f9a671cd9eda61054e3b686b59ca81ee02ef925)
@@ -458,6 +458,7 @@
     // Transition to closed valve state when fluid detected at upper level
     else if ( AIR_TRAP_LEVEL_FLUID == getRawAirTrapLevel( AIR_TRAP_LEVEL_SENSOR_UPPER ) )
     {
+        setValveAirTrap( STATE_CLOSED );
         airPumpOnDelayStartTime = u32DiffWithWrap( AIR_PUMP_ON_DELAY_ADJUST_AFTER_FILL, getMSTimerCount() );
         signalLowVenousPressureCheck();
         SEND_EVENT_WITH_2_U32_DATA( HD_EVENT_AIR_TRAP_FILL, STATE_CLOSED, 0 );