Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -r94789b2f2324d5901685b6ff7b6224d4af3a0276 -r520b5b97e2a1a6d7af037e1144f1ffeb39153e3e
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 94789b2f2324d5901685b6ff7b6224d4af3a0276)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 520b5b97e2a1a6d7af037e1144f1ffeb39153e3e)
@@ -79,6 +79,7 @@
 #define D5_HEATER_PWM_ADJ_SLOPE_FACTOR                             0.00005F                                                        ///< AC heater close loop PWM adjustment slope factor
 #define D5_HEATER_PWM_INTERCEPT_FACTOR                             0.0055F                                                         ///< AC heater close loop PWM adjustment intercept factor
 
+//#define D5_HEAT_CONTROL_INTERVAL_MS                                30000                                                           /// Primary heater control interval in milli seconds
 #define D5_HEAT_CONTROL_INTERVAL_MS                                3000                                                            /// Primary heater control interval in milli seconds
 #define D5_HEAT_CONTROL_INTERVAL_COUNT                             ( D5_HEAT_CONTROL_INTERVAL_MS / TASK_GENERAL_INTERVAL )         ///< Primary heater control interval count.
 #define D45_HEAT_CONTROL_INTERVAL_MS                               ( 3 * MS_PER_SECOND )                                           ///< Trimmer heater control interval in milli seconds
@@ -527,7 +528,7 @@
         }
         else
         {
-            measuredTempAtDialyzer      = getConductivityTemperature( D27_COND );
+            measuredTempAtDialyzer      = getFilteredConductivitySensorTemperature( D27_COND );
         }
 
         F32 calcTargetTemp              = getHeaterTargetTemperature( D5_HEAT );