Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -rc0e1f5f4c4657c156a87cc8be6c3db38bb14db33 -r05ab87b4de779f06243fa1e87a0402b659a6fa3e
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision c0e1f5f4c4657c156a87cc8be6c3db38bb14db33)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 05ab87b4de779f06243fa1e87a0402b659a6fa3e)
@@ -207,6 +207,7 @@
 static U32 startTimeToInitiateOuterloopTimeout;                                                                                    ///< Time to wait for temperature uptrend to seen,else initiate the outer loop control
 static U32 startTimeToCheckUpTrendTemperature;                                                                                     ///< Time to wait for measured dialyzer temperature uptrend check.
 static U32 startTimeToUndoOffsetFromHeatlossEstimation;                                                                            ///< Time to remove the offset that is added to heatloss model for Low Qds.
+static BOOL previousHeaterState[ NUM_OF_DD_HEATERS ];                                                                              ///< Previous State of Heater.
 
 //For testing
 #ifdef __HEATERS_DEBUG__
@@ -276,6 +277,10 @@
     d5OuterLoopControlInterval          = D5_TARGET_TEMP_ADJUST_HIGH_QD_INTERVAL;
     tempRiseMonitoringInterval          = TEMP_RISE_MONITORING_LOW_QD_INTERVAL;
 
+    //Initialize Previous Heater State
+    previousHeaterState[ D5_HEAT ]   = FALSE;
+    previousHeaterState[ D45_HEAT ]  = FALSE;
+
     // Assign counter close to the target period
     heatersStatus[ D5_HEAT ].controlIntervalCounter  = D5_HEAT_CONTROL_INTERVAL_START_COUNT;
     heatersStatus[ D45_HEAT ].controlIntervalCounter = 0;
@@ -797,8 +802,8 @@
 /*********************************************************************//**
  * @brief
  * The execHeatersControl function executes the heaters state machine.
- * @details \b Inputs: heaterStatus
- * @details \b Outputs: heaterStatus
+ * @details \b Inputs: heaterStatus, previousHeaterState
+ * @details \b Outputs: heaterStatus, previousHeaterState
  * @details \b Alarms: ALARM_ID_DD_SOFTWARE_FAULT when invalid heater
  * executive state found.
  * @return none
@@ -839,6 +844,13 @@
             // stop the heater
             stopHeater( heater );
         }
+
+        if ( heatersStatus[ heater ].heaterOnState != previousHeaterState[ heater ] )
+        {
+            SEND_EVENT_WITH_2_U32_DATA( DD_EVENT_HEATER_STATE_CHANGE, heater,
+                                        heatersStatus[ heater ].heaterOnState );
+            previousHeaterState[ heater ] = heatersStatus[ heater ].heaterOnState;
+        }
     }
 }