Index: firmware/App/Modes/PreTreatmentRecirc.c
===================================================================
diff -u -r9feea867113c62088f0ce91750127972dbd9bf53 -r84bb8663dae71170e1743a2bed37b0aa47465b47
--- firmware/App/Modes/PreTreatmentRecirc.c	(.../PreTreatmentRecirc.c)	(revision 9feea867113c62088f0ce91750127972dbd9bf53)
+++ firmware/App/Modes/PreTreatmentRecirc.c	(.../PreTreatmentRecirc.c)	(revision 84bb8663dae71170e1743a2bed37b0aa47465b47)
@@ -15,6 +15,7 @@
 *
 ***************************************************************************/
 
+#include "AirTrap.h"
 #include "DialInFlow.h"
 #include "DialOutFlow.h"
 #include "BloodFlow.h"
@@ -158,6 +159,7 @@
     setValveAirTrap( STATE_CLOSED );
     cmdSetDGActiveReservoir( DG_RESERVOIR_1 );
     cmdStartDGTrimmerHeater();
+    startAirTrapControl();
 
     setBloodPumpTargetFlowRate( BLOOD_PUMP_RECIRC_FLOW_RATE, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
     setDialInPumpTargetFlowRate( DIALYSATE_PUMP_RECIRC_FLOW_RATE, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
@@ -182,6 +184,7 @@
         signalDialInPumpHardStop();
         signalBloodPumpHardStop();
         cmdStopDGTrimmerHeater();
+        endAirTrapControl();
 
         state = PRE_TREATMENT_RECIRC_STOPPED_STATE;
     }