Index: firmware/App/Modes/ModeFault.c
===================================================================
diff -u -r04334ed8d1e927939718b1d62fb01afef0a2b9a9 -ra60ec05d359c0d3f014015e9080b6dbcef0fea28
--- firmware/App/Modes/ModeFault.c	(.../ModeFault.c)	(revision 04334ed8d1e927939718b1d62fb01afef0a2b9a9)
+++ firmware/App/Modes/ModeFault.c	(.../ModeFault.c)	(revision a60ec05d359c0d3f014015e9080b6dbcef0fea28)
@@ -15,9 +15,20 @@
  **************************************************************************/
 
 #include "AlarmLamp.h"
+#ifdef EMC_TEST_BUILD     // TODO - test code
+#include "BloodFlow.h"
+#include "Buttons.h"
+#include "DialInFlow.h"
+#include "DialOutFlow.h"
+#endif
 #include "OperationModes.h"
 #include "ModeFault.h"
 
+    /**
+     *  @addtogroup HDFaultMode
+     *  @{
+     */
+
 // ********** private data **********
 
 // ********** private function prototypes **********
@@ -55,9 +66,38 @@
  * Inputs : none
  * Outputs :
  * @param none
- * @return none
+ * @return current state (sub-mode)
  *************************************************************************/
-void execFaultMode( void )
+U32 execFaultMode( void )
 {
+#ifdef EMC_TEST_BUILD     // TODO - test code
+    static BOOL toggle = FALSE;
+    static BOOL button_state = FALSE;
+    BOOL stop = isStopButtonPressed();
+
+    if ( TRUE == stop )
+    {
+        if ( stop != button_state )
+        {
+            toggle = ( toggle == TRUE ? FALSE : TRUE );
+            if ( TRUE == toggle )
+            {
+                setBloodPumpTargetFlowRate( 500, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+                setDialInPumpTargetFlowRate( 500, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+                setDialOutPumpTargetRate( 500, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+            }
+            else
+            {
+                setBloodPumpTargetFlowRate( 0, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+                setDialInPumpTargetFlowRate( 0, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+                setDialOutPumpTargetRate( 0, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
+            }
+        }
+    }
+    button_state = stop;
+#endif
+
+    return 0; // TODO - return current state
 }
 
+/**@}*/