Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -r8afcd2d93c4b3a271c7190ff404484cb540f1700 -r96f8a305d3253904a4355cae78614a9333249896
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 8afcd2d93c4b3a271c7190ff404484cb540f1700)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 96f8a305d3253904a4355cae78614a9333249896)
@@ -78,6 +78,7 @@
 #define HEATERS_MAX_VOLTAGE_OUT_OF_RANGE_TOL                       0.2F                                                            ///< Heaters max voltage out of range tolerance.
 #define D5_HEATER_DEADBAND_CONTROL                                 0.1F                                                            ///< Heater dead band range for control.
 
+//#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                               ( 1 * MS_PER_SECOND )                                           ///< Trimmer heater control interval in milli seconds
@@ -606,9 +607,7 @@
     if ( ++primaryTargetTempAdjCounter >= d5OuterLoopControlInterval )
     {
 #ifdef __USE_D1_TEMP_
-
         // Use new RTD sensor placed closed to dialyzer, connected to D1 port
-
         measuredTempAtDialyzer = getFilteredTemperatureValue( D1_TEMP );
 #else
         if ( TRUE == getTestConfigStatus( TEST_CONFIG_DD_FP_ENABLE_BETA_1_9_HW ) )