Index: firmware/App/Modes/ModeHeatDisinfect.c
===================================================================
diff -u -rdf0a0b9ce1414b00b381e516714f9089d8e4ae21 -rc0160362dc799802ec589d5b6cf4c2bd1face77e
--- firmware/App/Modes/ModeHeatDisinfect.c	(.../ModeHeatDisinfect.c)	(revision df0a0b9ce1414b00b381e516714f9089d8e4ae21)
+++ firmware/App/Modes/ModeHeatDisinfect.c	(.../ModeHeatDisinfect.c)	(revision c0160362dc799802ec589d5b6cf4c2bd1face77e)
@@ -83,7 +83,7 @@
 // R1 to R2 & R2 to R1 heat disinfect circulation
 #define HEAT_DISINFECT_TARGET_RO_FLOW_LPM          1.3                                                         ///< Heat disinfect target RO flow rate in L/min.
 #define HEAT_DISINFECT_MAX_RO_PRESSURE_PSI         30                                                          ///< Heat disinfect maximum RO pressure in psi.
-#define HEAT_DISINFECT_TARGET_DRAIN_PRES_PSI       10.0                                                        ///< Heat disinfect target drain outlet pressure in psi.
+#define HEAT_DISINFECT_TARGET_DRAIN_PRES_PSI       12.0                                                        ///< Heat disinfect target drain outlet pressure in psi.
 #define HEAT_DISINFECT_TIME_MS                     ( 10 * SEC_PER_MIN * MS_PER_SECOND )                        ///< Heat disinfect time for each section in milliseconds.
 #define HEAT_DISINFECT_START_TEMP_TIMOUT_MS        ( 4 * MIN_PER_HOUR * SEC_PER_MIN * MS_PER_SECOND )          ///< Heat disinfect reaching to minimum temperature timeout in milliseconds.
 #define RSRVRS_TARGET_VOL_OUT_TIMEOUT_MS           ( 0.5 * SEC_PER_MIN * MS_PER_SECOND )                       ///< Reservoirs 1 & 2 maximum volume out of range timeout during heat disinfect. TODO change this to 5 seconds
@@ -2043,6 +2043,10 @@
 #endif
         }
     }
+    else if ( ( TRUE == isPartialDisinfectInProgress ) && ( ThdTemp > HEAT_DISINFECT_START_TEMPERATURE_C ) )
+    {
+        status = HEAT_DISINFECT_DISINFECT_IN_PROGRESS;
+    }
 
     // If heat disinfect temperature has been reached, check if this stage of heat disinfect is done
     if ( ( TRUE == isPartialDisinfectInProgress ) && ( TRUE == didTimeout( heatDisinfectTimer, HEAT_DISINFECT_TIME_MS ) ) )