Index: firmware/App/Services/Reservoirs.c
===================================================================
diff -u -r0a587d42b41c5d9a81f69b9c1ae526d4e23ceaa8 -rd106a0eefd1e2ffe5873cd862ebbd53c1002de27
--- firmware/App/Services/Reservoirs.c	(.../Reservoirs.c)	(revision 0a587d42b41c5d9a81f69b9c1ae526d4e23ceaa8)
+++ firmware/App/Services/Reservoirs.c	(.../Reservoirs.c)	(revision d106a0eefd1e2ffe5873cd862ebbd53c1002de27)
@@ -26,6 +26,7 @@
 #include "NVDataMgmt.h"
 #include "OperationModes.h"
 #include "Reservoirs.h"
+#include "SystemCommMessages.h"
 #include "TaskGeneral.h"
 #include "Timers.h"
 
Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -r8d28db49d2814645c048883053ad06a27bf294f6 -rd106a0eefd1e2ffe5873cd862ebbd53c1002de27
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 8d28db49d2814645c048883053ad06a27bf294f6)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision d106a0eefd1e2ffe5873cd862ebbd53c1002de27)
@@ -1812,6 +1812,10 @@
                 handleTestHDPendingACKOverrideRequest( message );
                 break;
 
+            case MSG_ID_HD_RECIRULATION_PCT_OVERRIDE:
+                handleTestHDRecirulationPctOverrideRequest( message );
+                break;
+
             // The default cannot be reached in VectorCAST since the cases are run in a for loop
             default:
                 // Unrecognized message ID received - ignore
Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r3f4105248e6c49ab487ec065f9a4843d72a16a2a -rd106a0eefd1e2ffe5873cd862ebbd53c1002de27
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 3f4105248e6c49ab487ec065f9a4843d72a16a2a)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision d106a0eefd1e2ffe5873cd862ebbd53c1002de27)
@@ -31,6 +31,7 @@
 #include "ModeStandby.h"
 #include "ModeInitPOST.h"
 #include "OperationModes.h"
+#include "Reservoirs.h"
 #include "RTC.h"
 #include "SampleWater.h"
 #include "SafetyShutdown.h"
@@ -8479,4 +8480,36 @@
     sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
 }
 
+/*********************************************************************//**
+ * @brief
+ * The handleTestHDRecirulationPctOverrideRequest function handles a
+ * request to override pending ACKs.
+ * @details Inputs: none
+ * @details Outputs: message handled
+ * @param message : a pointer to the message to handle
+ * @return none
+ *************************************************************************/
+void handleTestHDRecirulationPctOverrideRequest( 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 = testSetRecirculationLevelPctOverride( payload.state.f32 );
+        }
+        else
+        {
+            result = testResetRecirculationLevelPctOverride();
+        }
+    }
+
+    // Respond to request
+    sendTestAckResponseMsg( (MSG_ID_T)message->hdr.msgID, result );
+}
+
 /**@}*/
Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r3f4105248e6c49ab487ec065f9a4843d72a16a2a -rd106a0eefd1e2ffe5873cd862ebbd53c1002de27
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 3f4105248e6c49ab487ec065f9a4843d72a16a2a)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision d106a0eefd1e2ffe5873cd862ebbd53c1002de27)
@@ -1016,6 +1016,9 @@
 // MSG_ID_HD_CAN_RECEIVE_ACK_MESSAGE_OVERRIDE
 void handleTestHDPendingACKOverrideRequest( MESSAGE_T* message );
 
+// MSG_ID_HD_RECIRULATION_PCT_OVERRIDE
+void handleTestHDRecirulationPctOverrideRequest( MESSAGE_T* message );
+
 /**@}*/
 
 #endif