Index: firmware/App/Controllers/DGInterface.c
===================================================================
diff -u -r80fcb3eb82c20209b38471842307f7c0536547be -rf748628de6396c5059b0d85b4c96f6c3d81bd91a
--- firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision 80fcb3eb82c20209b38471842307f7c0536547be)
+++ firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision f748628de6396c5059b0d85b4c96f6c3d81bd91a)
@@ -54,8 +54,8 @@
 #define DIALYSATE_TEMP_LOWER_SAFETY_TIMEOUT_MS          ( 300 * MS_PER_SECOND )     ///< Dialysate temperature lower bound timeout in milliseconds.
 #define DIALYSATE_TEMP_CLEAR_TIMEOUT_MS                 ( 10 * MS_PER_SECOND )      ///< Dialysate temperature clear persistence timeout.
 #define DG_DATA_FRESHNESS_TIMEOUT_MS                    ( 3 * MS_PER_SECOND )       ///< DG data freshness timeout (in ms).
+#define DG_TRIMMER_HTR_CHECK_INTERVAL                   ( MS_PER_SECOND / TASK_GENERAL_INTERVAL + 2 )   ///< DG trimmer heater check interval in general task execution time counts.
 
-
 // ********** private data **********
 
 // DG status
@@ -180,9 +180,11 @@
     lgLoadCellBackupReadingsTotal[ DG_RESERVOIR_1 ] = 0.0F;
     lgLoadCellBackupReadingsTotal[ DG_RESERVOIR_2 ] = 0.0F;
 
-    initPersistentAlarm( ALARM_ID_HD_DIALYSATE_TEMP_OUT_OF_HIGH_SAFETY_RANGE, DIALYSATE_TEMP_CLEAR_TIMEOUT_MS, DIALYSATE_TEMP_OUT_OF_TARGET_TIMEOUT_MS );
-    initPersistentAlarm( ALARM_ID_HD_DIALYSATE_TEMP_OUT_OF_LOW_SAFETY_RANGE, DIALYSATE_TEMP_CLEAR_TIMEOUT_MS, DIALYSATE_TEMP_OUT_OF_TARGET_TIMEOUT_MS );
+    initPersistentAlarm( ALARM_ID_HD_DIALYSATE_TEMP_ABOVE_TARGET_TEMP, DIALYSATE_TEMP_CLEAR_TIMEOUT_MS, DIALYSATE_TEMP_OUT_OF_TARGET_TIMEOUT_MS );
+    initPersistentAlarm( ALARM_ID_HD_DIALYSATE_TEMP_BELOW_TARGET_TEMP, DIALYSATE_TEMP_CLEAR_TIMEOUT_MS, DIALYSATE_TEMP_OUT_OF_TARGET_TIMEOUT_MS );
+    initPersistentAlarm( ALARM_ID_HD_DIALYSATE_TEMP_ABOVE_SAFETY_TEMP, DIALYSATE_TEMP_CLEAR_TIMEOUT_MS, DIALYSATE_TEMP_UPPER_MAX_SAFETY_TIMEOUT_MS );
 
+
     initPersistentAlarm( ALARM_ID_HD_NEW_LOAD_CELL_DATA_MESSAGE_NOT_RECEIVE, DG_DATA_FRESHNESS_TIMEOUT_MS, DG_DATA_FRESHNESS_TIMEOUT_MS );
     initPersistentAlarm( ALARM_ID_HD_NEW_DIALYSATE_TEMPERATURE_DATA_MESSAGE_NOT_RECEIVE, DG_DATA_FRESHNESS_TIMEOUT_MS, DG_DATA_FRESHNESS_TIMEOUT_MS );
     initPersistentAlarm( ALARM_ID_HD_NEW_RESERVOIRS_DATA_MESSAGE_NOT_RECEIVE, DG_DATA_FRESHNESS_TIMEOUT_MS, DG_DATA_FRESHNESS_TIMEOUT_MS );
@@ -1186,39 +1188,36 @@
     if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_DIALYSATE_TEMP_CHECK ) != SW_CONFIG_ENABLE_VALUE )
 #endif
     {
-        // Per PRS 866
-        if ( TRUE == isAlarmActive( ALARM_ID_HD_DIALYSATE_TEMP_ABOVE_HIGH_SAFETY_RANGE ) )
+
+        if ( TRUE == isAlarmActive( ALARM_ID_HD_DIALYSATE_TEMP_ABOVE_SAFETY_TEMP ) )
         {
             isTDiTempAboveHighSafety = ( dgDialysateTemp <= ( dgTrimmerTempSet + DIALYSATE_TEMP_OUT_OF_TARGET_CLEAR_TOL_C ) ? FALSE : TRUE );
         }
-        checkPersistentAlarm( ALARM_ID_HD_DIALYSATE_TEMP_ABOVE_HIGH_SAFETY_RANGE, isTDiTempAboveHighSafety, dgDialysateTemp, DIALYSATE_TEMP_UPPER_MAX_SAFETY_LIMIT_C );
+        checkPersistentAlarm(ALARM_ID_HD_DIALYSATE_TEMP_ABOVE_SAFETY_TEMP, isTDiTempAboveHighSafety, dgDialysateTemp, dgTrimmerTempSet );
 
-        // Per PRS 377
-        if ( TRUE == isAlarmActive( ALARM_ID_HD_DIALYSATE_TEMP_OUT_OF_HIGH_SAFETY_RANGE ) )
+        if ( TRUE == isAlarmActive( ALARM_ID_HD_DIALYSATE_TEMP_ABOVE_TARGET_TEMP ) )
         {
+            isTDiTempAboveLowSafety = ( dgDialysateTemp <= ( dgTrimmerTempSet + DIALYSATE_TEMP_OUT_OF_TARGET_CLEAR_TOL_C ) ? FALSE : TRUE );
+        }
+        checkPersistentAlarm(ALARM_ID_HD_DIALYSATE_TEMP_ABOVE_TARGET_TEMP, isTDiTempAboveLowSafety, dgDialysateTemp, dgTrimmerTempSet );
+
+        if ( TRUE == isAlarmActive( ALARM_ID_HD_DIALYSATE_TEMP_ABOVE_TARGET_TEMP ) )
+        {
             isTDiTempAboveDialysateTarget = ( dgDialysateTemp <= ( dgTrimmerTempSet + DIALYSATE_TEMP_OUT_OF_TARGET_CLEAR_TOL_C ) ? FALSE : TRUE );
         }
         checkPersistentAlarm(ALARM_ID_HD_DIALYSATE_TEMP_ABOVE_TARGET_TEMP, isTDiTempAboveDialysateTarget, dgDialysateTemp, TDiHigh );
 
-        if ( TRUE == isAlarmActive( ALARM_ID_HD_DIALYSATE_TEMP_ABOVE_LOW_SAFETY_RANGE ) )
+        if ( TRUE == isAlarmActive( ALARM_ID_HD_DIALYSATE_TEMP_BELOW_TARGET_TEMP ) )
         {
-            isTDiTempAboveLowSafety = ( dgDialysateTemp <= ( dgTrimmerTempSet + DIALYSATE_TEMP_OUT_OF_TARGET_CLEAR_TOL_C ) ? FALSE : TRUE );
+            isTDITempBelowLowSafety = ( dgDialysateTemp <= ( dgTrimmerTempSet - DIALYSATE_TEMP_OUT_OF_TARGET_CLEAR_TOL_C ) ? FALSE : TRUE );
         }
-        checkPersistentAlarm( ALARM_ID_HD_DIALYSATE_TEMP_ABOVE_LOW_SAFETY_RANGE,  isTDiTempAboveLowSafety,  dgDialysateTemp, DIALYSATE_TEMP_UPPER_SAFETY_LIMIT_C );
+        checkPersistentAlarm(ALARM_ID_HD_DIALYSATE_TEMP_BELOW_TARGET_TEMP, isTDITempBelowLowSafety, dgDialysateTemp, dgTrimmerTempSet );
 
-        // Per PRS 124
-        if ( TRUE == isAlarmActive( ALARM_ID_HD_DIALYSATE_TEMP_OUT_OF_LOW_SAFETY_RANGE ) )
+        if ( TRUE == isAlarmActive( ALARM_ID_HD_DIALYSATE_TEMP_BELOW_TARGET_TEMP ) )
         {
             isTDiTempBelowDialysateTarget = ( dgDialysateTemp >= ( dgTrimmerTempSet - DIALYSATE_TEMP_OUT_OF_TARGET_CLEAR_TOL_C ) ? FALSE : TRUE );
         }
         checkPersistentAlarm(ALARM_ID_HD_DIALYSATE_TEMP_BELOW_TARGET_TEMP, isTDiTempBelowDialysateTarget, dgDialysateTemp, TDiLow );
-
-        if ( TRUE == isAlarmActive( ALARM_ID_HD_DIALYSATE_TEMP_BELOW_LOW_SAFETY_RANGE ) )
-        {
-            isTDITempBelowLowSafety = ( dgDialysateTemp >= ( dgTrimmerTempSet - DIALYSATE_TEMP_OUT_OF_TARGET_CLEAR_TOL_C ) ? FALSE : TRUE );
-        }
-        checkPersistentAlarm( ALARM_ID_HD_DIALYSATE_TEMP_BELOW_LOW_SAFETY_RANGE,  isTDITempBelowLowSafety,  dgDialysateTemp, DIALYSATE_TEMP_LOWER_SAFETY_LIMIT_C );
-
     }
 }