Index: firmware/App/Controllers/DGInterface.c
===================================================================
diff -u -r6e23d627c3f5a1ef3f7cca5d4e48eb478b0eef4c -ra6d1ff9f7223af8efaa54f47c217d44391740405
--- firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision 6e23d627c3f5a1ef3f7cca5d4e48eb478b0eef4c)
+++ firmware/App/Controllers/DGInterface.c	(.../DGInterface.c)	(revision a6d1ff9f7223af8efaa54f47c217d44391740405)
@@ -54,6 +54,7 @@
 #define DIALYSATE_TEMP_LOWER_SAFETY_TIMEOUT_MS          ( 300 * MS_PER_SECOND )     ///< Dialysate temperature lower bound timeout in milliseconds.
 #define DIALYSATE_TEMP_CLEAR_TIMEOUT_MS                 ( 30 * 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 **********
 
@@ -70,6 +71,8 @@
 static F32 dgHeatDisinfectTemp;                                             ///< Heat disinfect temperature reported by the DG.
 static F32 dgTrimmerTempSet;                                                ///< Trimmer heater target temperature commanded.
 
+static U32 dgTrimmerTempCheckTimerCtr;                                      ///< Trimmer heater temp check interval timer counter.
+
 /// Measured weight from load cells.
 static OVERRIDE_F32_T loadCellWeightInGrams[ NUM_OF_LOAD_CELLS ];
 
@@ -128,7 +131,8 @@
 
     dgStarted                       = FALSE;
     dgTrimmerHeaterOn               = FALSE;
-    dgTrimmerTempSet                = 0.0F;
+    dgTrimmerTempSet                = 0.0F;
+    dgTrimmerTempCheckTimerCtr      = 0;
     dgActiveReservoirSet            = DG_RESERVOIR_2;
     dgActiveReservoir               = DG_RESERVOIR_2;
     dgReservoirFillVolumeTargetSet  = 0;
@@ -249,7 +253,11 @@
         checkDGRestart();
 
         // Check the status of the trimmer heater
-        checkDGTrimmerHeaterStatus();
+        if ( ++dgTrimmerTempCheckTimerCtr >= DG_TRIMMER_HTR_CHECK_INTERVAL )
+        {
+            dgTrimmerTempCheckTimerCtr = 0;
+            checkDGTrimmerHeaterStatus();
+        }
     }
 }
 
@@ -479,6 +487,19 @@
 
 /*********************************************************************//**
  * @brief
+ * The getTrimmerHeaterCommandedOn function gets the latest on/off commanded
+ * status of the trimmer heater.
+ * @details Inputs: dgTrimmerHeaterOn
+ * @details Outputs: none
+ * @return dgTrimmerHeaterOn
+ *************************************************************************/
+BOOL getTrimmerHeaterCommandedOn( void )
+{
+    return dgTrimmerHeaterOn;
+}
+
+/*********************************************************************//**
+ * @brief
  * The getDGDisinfectsStates function returns the DG disinfects readings.
  * @details Inputs: none
  * @details Outputs: none
@@ -1112,7 +1133,7 @@
         switch ( dgCmdRespPtr->rejectCode )
         {
             case DG_CMD_REQUEST_REJECT_REASON_INVALID_PARAMETER:
-                activateAlarmNoData( ALARM_ID_DG_COMMAND_INVALID_PARAMETER_FAULT );
+                SET_ALARM_WITH_1_U32_DATA( ALARM_ID_DG_COMMAND_INVALID_PARAMETER_FAULT, dgCmdRespPtr->commandID );
                 break;
 
             case DG_CMD_REQUEST_REJECT_REASON_NONE: