Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -r6f961c6e113a4076ba9d5f97e078a398a8976d7c -r325e67dab10f6666702bf0f1256015b31e58de4f
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 6f961c6e113a4076ba9d5f97e078a398a8976d7c)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 325e67dab10f6666702bf0f1256015b31e58de4f)
@@ -742,7 +742,7 @@
         {
             measuredTemperature = getD4AverageTemperature();
             // Inlet temperature post heat exchanger
-            inletTemperature    = getTemperatureValue( X6_TEMP );
+            inletTemperature    = getTemperatureValue( D78_TEMP );
 
             if ( TRUE == startupHeaterControl )
             {