Index: firmware/App/Controllers/Pressures.c
===================================================================
diff -u -rc7d750b36ffa45ed57c73899aa7861e2d8d63be9 -r93a5ad88c7754e2d64d11d3425571aa27fe12652
--- firmware/App/Controllers/Pressures.c	(.../Pressures.c)	(revision c7d750b36ffa45ed57c73899aa7861e2d8d63be9)
+++ firmware/App/Controllers/Pressures.c	(.../Pressures.c)	(revision 93a5ad88c7754e2d64d11d3425571aa27fe12652)
@@ -69,6 +69,7 @@
 #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.
@@ -182,9 +183,30 @@
             F32 maxInletWaterPressureWarningLow = MAX_INLET_WATER_PRESSURE_WARNING_LOW_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 = MAX_FLUSH_INLET_WATER_PRESSURE_WARNING_LOW_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 = MAX_FLUSH_INLET_WATER_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 );