Index: firmware/App/Modes/ModeGenDialysate.c
===================================================================
diff -u -rbd896114f304304a7096b30b2a85067a64645e82 -re163e9faf44d2eb475188b8ea4d6a3befb6e753f
--- firmware/App/Modes/ModeGenDialysate.c	(.../ModeGenDialysate.c)	(revision bd896114f304304a7096b30b2a85067a64645e82)
+++ firmware/App/Modes/ModeGenDialysate.c	(.../ModeGenDialysate.c)	(revision e163e9faf44d2eb475188b8ea4d6a3befb6e753f)
@@ -226,6 +226,10 @@
             setD28TempFeedbackControl( TRUE );
             startHeater( D5_HEAT );
 
+            //Turn on Trimmer heater
+            setHeaterTargetTemperature( D45_HEAT,  getD4AverageTemperature() );
+            startHeater( D45_HEAT );
+
             //Testing : Enable close loop once testing is complete
             //setDialysatePumpTargetRPM( D12_PUMP, FRESH_DIAL_PUMP_INITIAL_RPM, FALSE );
             setDialysatePumpTargetRPM( D12_PUMP, FRESH_DIAL_PUMP_INITIAL_RPM, TRUE );
@@ -255,6 +259,10 @@
             setD28TempFeedbackControl( TRUE );
             startHeater( D5_HEAT );
 
+            //Turn on Trimmer heater
+            setHeaterTargetTemperature( D45_HEAT, getD4AverageTemperature() );
+            startHeater( D45_HEAT );
+
             //setDialysatePumpTargetRPM( D12_PUMP, FRESH_DIAL_PUMP_INITIAL_RPM, FALSE );
             setDialysatePumpTargetRPM( D12_PUMP, FRESH_DIAL_PUMP_INITIAL_RPM, TRUE );
             //setDialysatePumpTargetRPM( D48_PUMP, SPENT_DIAL_PUMP_INITIAL_RPM, FALSE );
@@ -289,6 +297,8 @@
             setHeaterTargetTemperature( D5_HEAT, getGenDialysateTargetTemperature() );
             setD28TempFeedbackControl( TRUE );
             startHeater( D5_HEAT );
+            // Stop trimmer heater
+            stopHeater( D45_HEAT );
 
             setDialysatePumpTargetRPM( D12_PUMP, FRESH_DIAL_PUMP_INITIAL_RPM, TRUE );
             setDialysatePumpTargetRPM( D48_PUMP, SPENT_DIAL_PUMP_FILL_RPM, TRUE );