Index: firmware/App/Controllers/Pressures.c
===================================================================
diff -u -rc7d750b36ffa45ed57c73899aa7861e2d8d63be9 -r5379702cf2aba320cad160bef6c381c0c9138a63
--- firmware/App/Controllers/Pressures.c	(.../Pressures.c)	(revision c7d750b36ffa45ed57c73899aa7861e2d8d63be9)
+++ firmware/App/Controllers/Pressures.c	(.../Pressures.c)	(revision 5379702cf2aba320cad160bef6c381c0c9138a63)
@@ -56,9 +56,10 @@
 #define MIN_VALID_BARO_PRESSURE_PSIA                10.1F                                           ///< Minimum valid barometric pressure in psia.
 #define MAX_VALID_BARO_PRESSURE_PSIA                15.4F                                           ///< Maximum valid barometric pressure in psia.
 
-#define MAX_INLET_WATER_PRESSURE_WARNING_LOW_PSIG   23.0F                                           ///< Maximum allowed low pressure value in psig.
-#define MAX_FLUSH_INLET_WATER_PRESSURE_WARNING_LOW_PSIG   14.0F                                     ///< Maximum allowed low pressure value for Flush in psig.
-#define MIN_INLET_WATER_PRESSURE_WARNING_LOW_PSIG   24.0F                                           ///< Minimum allowed low pressure value in psig.
+#define MIN_INLET_WATER_PRESSURE_WARNING_LOW_PSIG   23.0F                                           ///< Minimum allowed low pressure value in psig.
+#define MIN_FLUSH_INLET_PRESSURE_WARNING_LOW_PSIG   14.0F                                           ///< Minimum allowed low pressure value for Flush in psig.
+#define MIN_FLUSH_INLET_PRESSURE_TO_CLEAR_PSIG      15.0F                                           ///< Minimum allowed low pressure value for flush in psig.
+#define MIN_INLET_PRESSURE_TO_CLEAR_WARINING_PSIG   24.0F                                           ///< Minimum allowed low pressure value in psig.
 
 #define MAX_INLET_WATER_PRESSURE_WARNING_HIGH_PSIG  80.0F                                           ///< Maximum allowed high pressure value in psig.
 #define MIN_INLET_WATER_PRESSURE_WARNING_HIGH_PSIG  78.0F                                           ///< Minimum allowed high pressure value in psig.
@@ -69,6 +70,7 @@
 #define PRESSURES_DATA_PUB_INTERVAL                 ( MS_PER_SECOND / TASK_PRIORITY_INTERVAL )      ///< Interval (ms/task time) at which the pressures data is published on the CAN bus.
 #define DATA_PUBLISH_COUNTER_START_COUNT            10                                              ///< Data publish counter start count.
 #define PRESSURE_SENSORS_ADC_CHECK_ARRAY_LEN        4                                               ///< Pressure sensors ADC check array length.
+#define CLEANING_MODE_LOW_PRESSURE_STATE_NUMBER     3                                               ///< Cleaning mode low pressure state number.
 
 static const U32 TWO_TO_POWER_OF_6  = ( 1 << 6 );                                                   ///< 2^6.
 static const U32 TWO_TO_POWER_OF_7  = ( 1 << 7 );                                                   ///< 2^7.
@@ -179,16 +181,39 @@
         {
             BOOL isPressureTooLow;
             BOOL isPressureTooHigh;
-            F32 maxInletWaterPressureWarningLow = MAX_INLET_WATER_PRESSURE_WARNING_LOW_PSIG;
+            F32 maxInletWaterPressureWarningLow = MIN_INLET_WATER_PRESSURE_WARNING_LOW_PSIG;
+            F32 minInletWaterPressureWarningLow = MIN_INLET_PRESSURE_TO_CLEAR_WARINING_PSIG;
             DG_OP_MODE_T opMode                 = getCurrentOperationMode();
 
-            if ( DG_MODE_STAN == opMode )
+            switch ( opMode )
             {
-                maxInletWaterPressureWarningLow = MAX_FLUSH_INLET_WATER_PRESSURE_WARNING_LOW_PSIG;
+                case DG_MODE_STAN:
+                    maxInletWaterPressureWarningLow = MIN_FLUSH_INLET_PRESSURE_WARNING_LOW_PSIG;
+                    minInletWaterPressureWarningLow = MIN_FLUSH_INLET_PRESSURE_TO_CLEAR_PSIG;
+                    break;
+
+                case DG_MODE_FLUS:
+                case DG_MODE_HEAT:
+                case DG_MODE_CHEM:
+                case DG_MODE_CHFL:
+                case DG_MODE_ROPS:
+                    // Per PRS 401 the low pressure limit for the cleaning modes that have the filter flush state is 14 psig.
+                    // In the cleaning modes, flush, heat disinfect, chem disinfect, chem flush disinfect, and RO permeate sample, the 3rd state is
+                    // flush drain so only in that state the limit is set to 14 psig.
+                    // NOTE: Active cool does not have a flush drain state.
+                    if ( CLEANING_MODE_LOW_PRESSURE_STATE_NUMBER == getCurrentOperationSubMode() )
+                    {
+                        maxInletWaterPressureWarningLow = MIN_FLUSH_INLET_PRESSURE_WARNING_LOW_PSIG;
+                    }
+                    break;
+
+                default:
+                    // Do nothing for the rest of the modes since the default inlet pressure has been set.
+                    break;
             }
 
-            isPressureTooLow = ( pressure < maxInletWaterPressureWarningLow ? TRUE : FALSE );
-            isPressureTooLow = ( pressure > MAX_INLET_WATER_PRESSURE_WARNING_HIGH_PSIG ? TRUE : FALSE );
+            isPressureTooLow  = ( pressure < maxInletWaterPressureWarningLow ? TRUE : FALSE );
+            isPressureTooHigh = ( pressure > MAX_INLET_WATER_PRESSURE_WARNING_HIGH_PSIG ? TRUE : FALSE );
 
             switch( opMode )
             {
@@ -198,7 +223,7 @@
                 case DG_MODE_STAN:
                     if ( TRUE == isAlarmActive( ALARM_ID_DG_INLET_WATER_PRESSURE_IN_LOW_RANGE ) )
                     {
-                        isPressureTooLow = ( pressure >= MIN_INLET_WATER_PRESSURE_WARNING_LOW_PSIG ? FALSE : TRUE );
+                        isPressureTooLow = ( pressure >= minInletWaterPressureWarningLow ? FALSE : TRUE );
                     }
 
                     // Per PRS 401
@@ -222,7 +247,7 @@
                     // TODO define the PRS
                     checkPersistentAlarm( ALARM_ID_DG_CLEANING_MODE_INLET_WATER_PRESSURE_TOO_HIGH, isPressureTooHigh, pressure, MAX_INLET_WATER_PRESSURE_WARNING_HIGH_PSIG );
                     // TODO define the PRS
-                    checkPersistentAlarm( ALARM_ID_DG_CLEANING_MODE_INLET_WATER_PRESSURE_TOO_LOW, isPressureTooLow, pressure, MIN_INLET_WATER_PRESSURE_WARNING_LOW_PSIG );
+                    checkPersistentAlarm( ALARM_ID_DG_CLEANING_MODE_INLET_WATER_PRESSURE_TOO_LOW, isPressureTooLow, pressure, MIN_INLET_PRESSURE_TO_CLEAR_WARINING_PSIG );
                     break;
 
                 default:
@@ -234,10 +259,10 @@
     else
     {
         // VPI is closed - clear all alarms
-        checkPersistentAlarm( ALARM_ID_DG_INLET_WATER_PRESSURE_IN_LOW_RANGE, FALSE, pressure, MAX_INLET_WATER_PRESSURE_WARNING_LOW_PSIG );
+        checkPersistentAlarm( ALARM_ID_DG_INLET_WATER_PRESSURE_IN_LOW_RANGE, FALSE, pressure, MIN_INLET_WATER_PRESSURE_WARNING_LOW_PSIG );
         checkPersistentAlarm( ALARM_ID_DG_INLET_WATER_PRESSURE_IN_HIGH_RANGE, FALSE, pressure, MAX_INLET_WATER_PRESSURE_WARNING_HIGH_PSIG );
         checkPersistentAlarm( ALARM_ID_DG_CLEANING_MODE_INLET_WATER_PRESSURE_TOO_HIGH, FALSE, pressure, MAX_INLET_WATER_PRESSURE_WARNING_HIGH_PSIG );
-        checkPersistentAlarm( ALARM_ID_DG_CLEANING_MODE_INLET_WATER_PRESSURE_TOO_LOW, FALSE, pressure, MIN_INLET_WATER_PRESSURE_WARNING_LOW_PSIG );
+        checkPersistentAlarm( ALARM_ID_DG_CLEANING_MODE_INLET_WATER_PRESSURE_TOO_LOW, FALSE, pressure, MIN_INLET_PRESSURE_TO_CLEAR_WARINING_PSIG );
     }
 }