Index: firmware/App/Modes/FPModes/ModeGenPermeate.c
===================================================================
diff -u -r1abceb4d33eba70426f0bad68060beaf70210cbb -re1da3c63d3b8690d6593a7cc631a383fd942a95b
--- firmware/App/Modes/FPModes/ModeGenPermeate.c	(.../ModeGenPermeate.c)	(revision 1abceb4d33eba70426f0bad68060beaf70210cbb)
+++ firmware/App/Modes/FPModes/ModeGenPermeate.c	(.../ModeGenPermeate.c)	(revision e1da3c63d3b8690d6593a7cc631a383fd942a95b)
@@ -47,7 +47,9 @@
 #define RO_REJECTION_WAIT_TIME_MS                    ( 8 * MS_PER_SECOND )                        ///< RO rejection alarm wait time. 5 seconds for RR to stabilize and 3 seconds for calculating rolling average ( in ms )
 #define MIN_SAMPLES_NEEDED_FOR_DUTY_CYCLE_AVG        10                                           ///< Minimum number for samples needed for calculating the average duty cycle
 #define PERMEATE_FLOW_OUT_RANGE_PERSISTENCE_TIME_MS  ( 1 * MS_PER_SECOND )                        ///< Verify Water timer ( in ms )
-#define PERMEATE_FLOW_TOLERANCE                      1.25                                         ///< Permeate flow tolerance limit
+#define PERMEATE_FLOW_TOLERANCE                      1.25                                         ///< Permeate flow high tolerance limit
+#define PERMEATE_FLOW_FAULT_MIN_THRESHOLD            200.0F                                       ///< Permeate flow low tolerance limit
+#define PERMEATE_FLOW_OUT_OF_RANGE_TIMEOUT_MS        ( 12 * MS_PER_SECOND )                       ///< Permeate flow low tolerance out of range timeout
 
 // ********** private data **********
 
@@ -120,6 +122,9 @@
     startPermeateTankControl();
     setROPumpTargetFlowRateMLPM( GEN_PERMEATE_RO_PUMP_TGT_ML, TRUE );
 
+    initPersistentAlarm( ALARM_ID_FP_PERMEATE_FLOW_OUT_LOW_RANGE,
+                         0, PERMEATE_FLOW_OUT_OF_RANGE_TIMEOUT_MS );
+
     return genPermeateState;
 }
 
@@ -182,6 +187,8 @@
         permeateFlowPersistanceStartTimeMS = 0;
     }
 
+    checkPermeateFlow();
+
     //Publish Gen Permeate mode data
     publishGenPModeData();
 
@@ -398,6 +405,26 @@
 
 /*********************************************************************//**
  * @brief
+ * The checkPermeateFlow function checks the permeate flow rate from P16
+ * against the set target flow rate and alarm if the flow is out of range.
+ * @details \b Inputs: permeateFlow
+ * @details \b Outputs: none
+ * @details \b Alarms: ALARM_ID_FP_PERMEATE_FLOW_OUT_LOW_RANGE when
+ * P16 flow goes beyond threshold limit from set target flow.
+ * @return none
+ *************************************************************************/
+void checkPermeateFlow( void )
+{
+    F32 permeateFlow = getFilteredFlow( P16_FLOW );
+    BOOL isFlowOutOfRange = FALSE;
+    F32 minimumAllowedPermeateFlow = (F32)getTargetROPumpFlowRateMLPM() - PERMEATE_FLOW_FAULT_MIN_THRESHOLD;
+
+    isFlowOutOfRange = ( ( permeateFlow < minimumAllowedPermeateFlow ) ? TRUE : FALSE);
+    checkPersistentAlarm( ALARM_ID_FP_PERMEATE_FLOW_OUT_LOW_RANGE, isFlowOutOfRange, permeateFlow, minimumAllowedPermeateFlow);
+}
+
+/*********************************************************************//**
+ * @brief
  * The requestGenWaterStart function handles an DD request to start (go to gen permeate mode).
  * @details \b Inputs: none
  * @details \b Outputs: none