Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -r1b4447ba6fdc3d90a9013571b5710a52295c43d3 -rfa75c4efb5820c4030cf621fda6f58279ad292ba
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 1b4447ba6fdc3d90a9013571b5710a52295c43d3)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision fa75c4efb5820c4030cf621fda6f58279ad292ba)
@@ -48,7 +48,8 @@
 
 #define HEATERS_MAX_DUTY_CYCLE                                     1.00F                                                           ///< Heaters max duty cycle (100%).
 #define HEATERS_MIN_DUTY_CYCLE                                     0.00F                                                           ///< Heaters minimum duty cycle (0.00%).
-#define HEATERS_DISINFECT_TEMPERATURE_DRIFT_C                      1.0F                                                            ///< Heaters disinfect temperature drift in C.
+#define HEATERS_DISINFECT_DUTY_CYCLE                               0.60F                                                           ///< Heaters disinfect cycle.
+#define HEATERS_DISINFECT_TEMPERATURE_DRIFT_C                      3.0F                                                            ///< Heaters disinfect temperature drift in C.
 #define HEATERS_MIN_EST_GAIN                                       0.2F                                                            ///< Heaters minimum estimation gain.
 #define HEATERS_MAX_EST_GAIN                                       5.0F                                                            ///< Heaters maximum estimation gain.
 #define HEATERS_NEUTRAL_EST_GAIN                                   1.0F                                                            ///< Heaters neutral estimation gain.
@@ -543,11 +544,16 @@
     F32 currentTemperature = getTemperatureValue( TEMPSENSORS_HEAT_DISINFECT );
     F32 targetTemperature  = heatersStatus[ DG_PRIMARY_HEATER ].targetTemp;
 
-    if ( ( currentTemperature < targetTemperature ) || ( currentTemperature - targetTemperature > HEATERS_DISINFECT_TEMPERATURE_DRIFT_C ) )
+    if ( currentTemperature < targetTemperature )
     {
         setHeaterDutyCycle( DG_TRIMMER_HEATER, HEATERS_MAX_DUTY_CYCLE );
         setHeaterDutyCycle( DG_PRIMARY_HEATER, HEATERS_MAX_DUTY_CYCLE );
     }
+    else if ( currentTemperature - targetTemperature < HEATERS_DISINFECT_TEMPERATURE_DRIFT_C )
+    {
+        setHeaterDutyCycle( DG_TRIMMER_HEATER, HEATERS_DISINFECT_DUTY_CYCLE );
+        setHeaterDutyCycle( DG_PRIMARY_HEATER, HEATERS_DISINFECT_DUTY_CYCLE );
+    }
     else
     {
         setHeaterDutyCycle( DG_TRIMMER_HEATER, HEATERS_MIN_DUTY_CYCLE );