Index: firmware/App/Controllers/DGInterface.c
===================================================================
diff -u -recd93a26667363e9664bdc81af777c22125596ee -re654b368ff8f4d194678db88f1cda57b04e7d947
--- firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision ecd93a26667363e9664bdc81af777c22125596ee)
+++ firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision e654b368ff8f4d194678db88f1cda57b04e7d947)
@@ -68,7 +68,7 @@
 static U32 timeStartMS = 0; // TODO is this needed?
 
 // DG sensor data
-static F32 dgDialysateTemp;                                     ///< Dialysate temperature reported by the DG.
+static F32 dgDialysateTemp = 0.0;                               ///< Dialysate temperature reported by the DG.
 static F32 dgRedundantDialysateTemp = 0.0;                      ///< Redundant dialysate temperature reported by the DG.
 static F32 dgPrimaryTemp = 0.0;                                 ///< Latest RO water temperature reported by the DG.
 static F32 dgTrimmerTempSet = 0.0;                              ///< Trimmer heater target temperature commanded.
@@ -129,6 +129,7 @@
     dgStarted = FALSE;
     dgTrimmerHeaterOn = FALSE;
     dgTrimmerTempSet = 0.0;
+    dgDialysateTemp = 0.0;
     dgActiveReservoirSet = DG_RESERVOIR_2;
     dgReservoirFillVolumeTargetSet = 0;
     dgReservoirDrainVolumeTargetSet = 0;
@@ -1012,7 +1013,7 @@
  *************************************************************************/
 void checkDialysateTemperature( void )
 {
-    /*BOOL const dialysateHighTemp = ( ( ( dgDialysateTemp - dgTrimmerTempSet ) > DIALYSATE_TEMP_TOLERANCE_C ) ||
+    BOOL const dialysateHighTemp = ( ( ( dgDialysateTemp - dgTrimmerTempSet ) > DIALYSATE_TEMP_TOLERANCE_C ) ||
                                      ( dgDialysateTemp > DIALYSATE_TEMP_HIGH_LIMIT_C ) );
 
     BOOL const dialysateLowTemp = ( ( ( dgTrimmerTempSet - dgDialysateTemp ) > DIALYSATE_TEMP_TOLERANCE_C ) ||
@@ -1043,7 +1044,7 @@
         {
             clearAlarmCondition( ALARM_ID_DIALYSATE_TEMPERATURE_LOW );
         }
-    }*/
+    }
 }
 
 // ********** private functions **********