Index: firmware/App/Modes/FPModes/ModePreGenPermeate.c
===================================================================
diff -u -rb569bc796c56acd5d94d468386f5f42c350cad65 -rcb8619fdf8690885708071d34b0e87e6657ecd62
--- firmware/App/Modes/FPModes/ModePreGenPermeate.c	(.../ModePreGenPermeate.c)	(revision b569bc796c56acd5d94d468386f5f42c350cad65)
+++ firmware/App/Modes/FPModes/ModePreGenPermeate.c	(.../ModePreGenPermeate.c)	(revision cb8619fdf8690885708071d34b0e87e6657ecd62)
@@ -18,6 +18,7 @@
 #include "BoostPump.h"
 #include "FPModeStandby.h"
 #include "FPOperationModes.h"
+#include "Level.h"
 #include "MessageSupport.h"
 #include "Messaging.h"
 #include "ModeGenPermeate.h"
@@ -447,6 +448,67 @@
 
 /*********************************************************************//**
  * @brief
+ * The signalNewPreGenPSubMode function requests transition to a new
+ * PreGen Permeate sub mode.
+ * @details \b Inputs: none
+ * @details \b Outputs: none
+ * @return TRUE if request successful, FALSE if not
+ *************************************************************************/
+BOOL signalNewPreGenPSubMode( U32 newSubMode )
+{
+    BOOL result = FALSE;
+    FP_PRE_GENP_MODE_STATE_T reqSubMode = (FP_PRE_GENP_MODE_STATE_T)newSubMode;
+    LEVEL_STATE_T level = getLevelStatus( P25_LEVL );
+
+    if ( reqSubMode < NUM_OF_FP_PRE_GENW_MODE_STATES )
+    {
+        switch ( reqSubMode )
+        {
+            case FP_PRE_GENP_INLET_PRESSURE_CHECK:
+                preGenPState = FP_PRE_GENP_INLET_PRESSURE_CHECK;
+                setModePreGenPTransition( reqSubMode );
+                result = TRUE;
+                break;
+
+            case FP_PRE_GENP_FILTER_FLUSH:
+                preGenPState = FP_PRE_GENP_FILTER_FLUSH;
+                setModePreGenPTransition( reqSubMode );
+                result = TRUE;
+                break;
+
+            case FP_PRE_GENP_PERMEATE_FLUSH:
+                preGenPState = FP_PRE_GENP_PERMEATE_FLUSH;
+                setModePreGenPTransition( reqSubMode );
+                result = TRUE;
+                break;
+
+            case FP_PRE_GENP_CONCENTRATE_FLUSH:
+                // jump to concentrate flush sub mode only if the permeate tank is full
+                if ( LEVEL_STATE_HIGH == level )
+                {
+                    preGenPState = FP_PRE_GENP_CONCENTRATE_FLUSH;
+                    setModePreGenPTransition( reqSubMode );
+                }
+                break;
+
+            case FP_PRE_GENP_VERIFY_WATER:
+                preGenPState = FP_PRE_GENP_VERIFY_WATER;
+                setModePreGenPTransition( reqSubMode );
+                result = TRUE;
+                break;
+
+            case FP_PRE_GENP_PAUSED:
+            default:
+                result = FALSE;
+                break;
+        }
+    }
+
+    return result;  // TODO can this be a void function
+}
+
+/*********************************************************************//**
+ * @brief
  * The getPreGenWDataPublishInterval function gets the pre generate water
  * mode data publish interval.
  * @details \b Inputs: genWaterDataPublishInterval