Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -rbd1f452097afa4da0f60f64ecc6b6aab0a341d8c -rd371983d84daf213db3e39d21cf30c13161ce062
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision bd1f452097afa4da0f60f64ecc6b6aab0a341d8c)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision d371983d84daf213db3e39d21cf30c13161ce062)
@@ -7,8 +7,8 @@
 *
 * @file    SystemCommMessages.c
 *
-* @author  (last)      Sean Nash
-* @date    (last)      24-Aug-2023
+* @author  (last)      Michael Garthwaite
+* @date    (last)      11-Sep-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
@@ -1132,6 +1132,27 @@
 
 /*********************************************************************//**
  * @brief
+ * The handleParkConecentratePumpsCmd function handles a DG concentrate pumps park
+ * command message from the HD.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleParkConecentratePumpsCmd( MESSAGE_T *message )
+{
+    BOOL result = FALSE;
+
+    if ( message->hdr.payloadLen == 0 )
+    {
+        result = handleConcentratePumpParkRequest();
+    }
+
+    sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_DG_2_HD, result );
+}
+
+/*********************************************************************//**
+ * @brief
  * The handleStartStopTrimmerHeaterCmd function handles a trimmer heater start/stop
  * command message from the HD.
  * @details Inputs: none
@@ -1229,7 +1250,7 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
 
-/*************************************************************************
+/*********************************************************************//**
  * @brief
  * The handleStartStopDGHeatDisinfect function handles a request start or
  * stop DG heat disifect mode.
@@ -1686,7 +1707,7 @@
     sendAckResponseMsg( (MSG_ID_T)message->hdr.msgID, COMM_BUFFER_OUT_CAN_DG_2_UI, result );
 }
 
-/*************************************************************************
+/*********************************************************************//**
  * @brief
  * The handleStartStopDGHeatDisinfectActiveCool function handles a request
  * start or stop DG heat disinfect active cool mode.
@@ -1814,7 +1835,7 @@
     serializeMessage( msg, COMM_BUFFER_OUT_CAN_DG_2_UI, ACK_REQUIRED );
 }
 
-/*************************************************************************
+/*********************************************************************//**
  * @brief
  * The handleStartStopDGROPermeateSample function handles a request to
  * start or stop DG RO permeate sample mode.
@@ -2557,7 +2578,7 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
 
-/*************************************************************************
+/*********************************************************************//**
  * @brief
  * The handleSetDrainPumpTargetOutletFlowLPM function handles a
  * request to set the drain pump outlet flow in L/min.
@@ -2583,7 +2604,7 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
 
-/*************************************************************************
+/*********************************************************************//**
  * @brief
  * The handleSetSwitchesStatusOverrideRequest function handles a
  * request to override the status of a switch in DG.
@@ -5044,4 +5065,99 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
 
+/*********************************************************************//**
+ * @brief
+ * The handleTestDG77CStateTimerOverride function handles a request
+ * to override the heat disinfection timer at 77 C
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleTestDG77CStateTimerOverride( MESSAGE_T * message )
+{
+    TEST_OVERRIDE_PAYLOAD_T payload;
+    BOOL result = FALSE;
+
+    // verify payload length
+    if ( sizeof( TEST_OVERRIDE_PAYLOAD_T ) == message->hdr.payloadLen )
+    {
+        memcpy( &payload, message->payload, sizeof( TEST_OVERRIDE_PAYLOAD_T ) );
+        if ( FALSE == payload.reset )
+        {
+            result = testSetDG77CStateTimerOverride( payload.state.u32 );
+        }
+        else
+        {
+            result = testResetDG77CStateTimerOverride();
+        }
+    }
+
+    // respond to request
+    sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
+}
+
+/*********************************************************************//**
+ * @brief
+ * The handleTestDG82CStateTimerOverride function handles a request
+ * to override the heat disinfection timer at 82 C
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleTestDG82CStateTimerOverride( MESSAGE_T * message )
+{
+    TEST_OVERRIDE_PAYLOAD_T payload;
+    BOOL result = FALSE;
+
+    // verify payload length
+    if ( sizeof( TEST_OVERRIDE_PAYLOAD_T ) == message->hdr.payloadLen )
+    {
+        memcpy( &payload, message->payload, sizeof( TEST_OVERRIDE_PAYLOAD_T ) );
+        if ( FALSE == payload.reset )
+        {
+            result = testSetDG82CStateTimerOverride( payload.state.u32 );
+        }
+        else
+        {
+            result = testResetDG82CStateTimerOverride();
+        }
+    }
+
+    // respond to request
+    sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
+}
+
+/*********************************************************************//**
+ * @brief
+ * The handleTestChemDisinfectAcidOverride function handles a request
+ * to override the CD2 moving average in Chem disinfection.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleTestChemDisinfectAcidOverride( MESSAGE_T * message )
+{
+    TEST_OVERRIDE_PAYLOAD_T payload;
+    BOOL result = FALSE;
+
+    // verify payload length
+    if ( sizeof( TEST_OVERRIDE_PAYLOAD_T ) == message->hdr.payloadLen )
+    {
+        memcpy( &payload, message->payload, sizeof( TEST_OVERRIDE_PAYLOAD_T ) );
+        if ( FALSE == payload.reset )
+        {
+            result = testSetChemDisinfectionCD2AvgOverride( payload.state.f32 );
+        }
+        else
+        {
+            result = testResetChemDisinfectionCD2AvgOverride();
+        }
+    }
+
+    // respond to request
+    sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
+}
 /**@}*/