Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -r53d6550ebd61a9527cbecd507e326cc3079c05ce -r08fd3b3564f6852dec6d2038d37f66b8692fdf44
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 53d6550ebd61a9527cbecd507e326cc3079c05ce)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 08fd3b3564f6852dec6d2038d37f66b8692fdf44)
@@ -40,8 +40,10 @@
 
 // ********** private definitions **********
 
-#define HEATERS_MAX_DUTY_CYCLE                                     1.00F                                                           ///< Heaters max duty cycle (100%) or ON state
-#define HEATERS_MIN_DUTY_CYCLE                                     0.00F                                                           ///< Heaters minimum duty cycle (0.00%) or OFF state
+#define HEATERS_MAX_DUTY_CYCLE                                     1.00F                                                           ///< Heater max duty cycle (100%) or ON state
+#define HEATERS_MIN_DUTY_CYCLE                                     0.00F                                                           ///< Heater minimum duty cycle (0.00%) or OFF state
+#define HEATER_PWM_FULL_SCALE                                      450                                                             ///< Heater full scale PWM value.
+#define HEATER_PWM_OFFSET                                          25                                                              ///< Heater PWM offset.
 #define HEATER_ON_CTRL_DUTY_CYCLE                                  1.00F                                                           ///< Heater ON control duty cycle.
 #define HEATERS_DISINFECT_DUTY_CYCLE                               0.80F                                                           ///< Heaters disinfect cycle.
 #define HEATERS_DISINFECT_TRANSFER_DUTY_CYCLE                      0.60F                                                           ///< Heaters disinfect transfer duty cycle.
@@ -455,10 +457,16 @@
  *************************************************************************/
 static void setHeaterControl( void )
 {
-    F32 ctrl;
+    F32  ctrl = getHeaterControl();
+    BOOL enable = FALSE;
+    U16  pwm = (U16)( ctrl * (F32)HEATER_PWM_FULL_SCALE + (F32)HEATER_PWM_OFFSET + 0.5F );
 
-    ctrl = getHeaterControl();
-//    setFPGACPrimaryHeaterOnOffControl( (BOOL)ctrl );  // TODO ctrl is F32 - why casting as BOOL????      // TODO - implement FPGA set function
+    if ( ctrl > 0.0F )
+    {
+        enable = TRUE;
+    }
+    setFPGAHeaterEnabled( enable );
+    setFPGAHeaterPWM( pwm );
 }
 
 /*********************************************************************//**