Index: firmware/App/Modes/ModeHeatDisinfect.c
===================================================================
diff -u -r3e5c16b70fb34da7d58f5cf6efff896fdb3d00c3 -ra33ab8f72a09be4650026964dd2bd35ff95c8431
--- firmware/App/Modes/ModeHeatDisinfect.c	(.../ModeHeatDisinfect.c)	(revision 3e5c16b70fb34da7d58f5cf6efff896fdb3d00c3)
+++ firmware/App/Modes/ModeHeatDisinfect.c	(.../ModeHeatDisinfect.c)	(revision a33ab8f72a09be4650026964dd2bd35ff95c8431)
@@ -79,6 +79,7 @@
 #define RSRVRS_DRAIN_TIMEOUT_MS                    ( 2 * SEC_PER_MIN * MS_PER_SECOND )                         ///< Reservoirs 1 & 2 drain timeout in ms.
 
 // Target temperature
+#define HEAT_DISINFECT_PRIM_HEATER_FLUSH_TARGET_TEMP_C 60.0F                                                   ///< Heat disinfect primary heater flush target temperature C.
 #define HEAT_DISINFECT_PRIM_HEATER_TARGET_TEMP_C   90.0F                                                       ///< Heat disinfect primary heater target temperature in C.
 #define HEAT_DISINFECT_TRIM_HEATER_TARGET_TEMP_C   90.0F                                                       ///< Heat disinfect trimmer heater target temperature in C.
 #define HEAT_DISINFECT_CONC_PUMPS_START_TEMP_C     75.0F                                                       ///< Heat disinfect start concentrate pumps target temperature in C.
@@ -724,7 +725,7 @@
             if ( nelsonSupport != NELSON_INOCULATE )
 #endif
             {
-                setHeaterTargetTemperature( DG_PRIMARY_HEATER, HEAT_DISINFECT_PRIM_HEATER_TARGET_TEMP_C );
+                setHeaterTargetTemperature( DG_PRIMARY_HEATER, HEAT_DISINFECT_PRIM_HEATER_FLUSH_TARGET_TEMP_C );
                 startHeater( DG_PRIMARY_HEATER );
             }