Index: firmware/App/Modes/ModeRecirculate.c
===================================================================
diff -u -r3f7d30b23906496854054949d4491f3bae6ef3c4 -rf656b17f3d8d93b4fca49c9725e096e7eb55acc7
--- firmware/App/Modes/ModeRecirculate.c	(.../ModeRecirculate.c)	(revision 3f7d30b23906496854054949d4491f3bae6ef3c4)
+++ firmware/App/Modes/ModeRecirculate.c	(.../ModeRecirculate.c)	(revision f656b17f3d8d93b4fca49c9725e096e7eb55acc7)
@@ -93,21 +93,25 @@
     setValveState( VRC, VALVE_STATE_DRAIN_C_TO_NO );
     setValveState( VDR, VALVE_STATE_DRAIN_C_TO_NO );
     setValveState( VPO, VALVE_STATE_NOFILL_C_TO_NO );
-    setROPumpTargetFlowRate( TARGET_RO_FLOW_RATE_L, TARGET_RO_PRESSURE_PSI );
 
     signalDrainPumpHardStop();
     requestConcentratePumpsOff( CONCENTRATEPUMPS_CP1_ACID );
     requestConcentratePumpsOff( CONCENTRATEPUMPS_CP2_BICARB );
 
-    // UV on
+    // UV reactors on
     turnOnUVReactor( INLET_UV_REACTOR );
     turnOnUVReactor( OUTLET_UV_REACTOR );
 
     // TODO remove
     setPrimaryHeaterTargetTemperature( 39.0 );
-    startPrimaryHeater();
     // TODO remove
 
+    // NOTE: The target flow rate should be set prior to setting the start primary heater
+    // because the initial guess in the heaters driver needs the target flow to calculate
+    // the new PWMs for the main and small primary heaters
+    setROPumpTargetFlowRate( TARGET_RO_FLOW_RATE_L, TARGET_RO_PRESSURE_PSI );
+    startPrimaryHeater();
+
 #ifndef _VECTORCAST_
     {   // TODO - test code to start the fan since we're turning the heater on
         F32 fanPWM = 0.25;