Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -rc85d9f0a8023fabdf1cd557965958d225e2b9085 -rb6d20d9e5c704a9f7ebceea9bb12731dac61fc2a
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision c85d9f0a8023fabdf1cd557965958d225e2b9085)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision b6d20d9e5c704a9f7ebceea9bb12731dac61fc2a)
@@ -87,6 +87,14 @@
     F32 prevDiaTargetFlowLPM;                                                                                                      ///< Heater previous target dialysate flow in L/min.
 } HEATER_STATUS_T;
 
+/// Payload record structure for heaters start request
+typedef struct
+{
+    U32 heaterID;                                                                                                                   ///< Heater ID (0: Primary, 1: Trimmer)
+    U32 startStop;                                                                                                                  ///< Heater Start:1 and Stop: 0
+    F32 temperature;                                                                                                                ///< Temperature range ( 10.0 to 90.0 deg )
+} HEATER_START_CMD_PAYLOAD_T;
+
 static HEATER_STATUS_T heatersStatus[ NUM_OF_DD_HEATERS ];                                                                         ///< Heaters status.
 static U32 dataPublicationTimerCounter;                                                                                            ///< Data publication timer counter.
 static OVERRIDE_U32_T heatersDataPublishInterval = { HEATERS_DATA_PUBLISH_INTERVAL, HEATERS_DATA_PUBLISH_INTERVAL, 0, 0 };         ///< Heaters data publish time interval.
@@ -662,4 +670,52 @@
     return result;
 }
 
+/*********************************************************************//**
+ * @brief
+ * The testHeaterStartStopOverride function starts/stops a given heater
+ * at mentioned temperature.
+ * @details \b Inputs: tester logged in
+ * @details \b Outputs: heatersStatus[]
+ * @param message set message from Dialin which includes the heater to set
+ * and the state to set the heater to.
+ * @return TRUE if set request is successful, FALSE if not
+ *************************************************************************/
+BOOL testHeaterStartStopOverride( MESSAGE_T *message )
+{
+    BOOL result = FALSE;
+
+    // Verify tester has logged in with TD
+    if ( TRUE == isTestingActivated() )
+    {
+        // Verify payload length is valid
+        if ( sizeof( HEATER_START_CMD_PAYLOAD_T ) == message->hdr.payloadLen )
+        {
+            HEATER_START_CMD_PAYLOAD_T payload;
+
+            memcpy( &payload, message->payload, sizeof(HEATER_START_CMD_PAYLOAD_T) );
+
+            if ( (DD_HEATERS_T)payload.heaterID < NUM_OF_DD_HEATERS )
+            {
+                // Handle start command
+                if ( ( TRUE == payload.startStop ) &&
+                      ( ( payload.temperature >= HEATER_TARGET_TEMPERATURE_MIN ) && ( payload.temperature <= HEATER_TARGET_TEMPERATURE_MAX ) ) )
+                {
+                    setHeaterTargetTemperature( (DD_HEATERS_T)payload.heaterID, payload.temperature );
+                    startHeater( (DD_HEATERS_T)payload.heaterID );
+                    result = TRUE;
+                }
+
+                //Handle stop command
+                if ( FALSE == payload.startStop )
+                {
+                    stopHeater( (DD_HEATERS_T)payload.heaterID );
+                    result = TRUE;
+                }
+            }
+        }
+    }
+
+    return result;
+}
+
 /**@}*/