Index: firmware/App/Controllers/Pressures.c
===================================================================
diff -u -re0cdf49eb0f54239e5d765282e0952cea7ded1bd -r66cc826068b54bc436cde0fae70a05ba6c1ac974
--- firmware/App/Controllers/Pressures.c	(.../Pressures.c)	(revision e0cdf49eb0f54239e5d765282e0952cea7ded1bd)
+++ firmware/App/Controllers/Pressures.c	(.../Pressures.c)	(revision 66cc826068b54bc436cde0fae70a05ba6c1ac974)
@@ -8,7 +8,7 @@
 * @file    Pressures.c
 *
 * @author  (last)      Dara Navaei
-* @date    (last)      04-Feb-2022
+* @date    (last)      31-Mar-2022
 *
 * @author  (original)  Sean
 * @date    (original)  04-Apr-2020
@@ -46,7 +46,9 @@
 #define MIN_VALID_PRESSURE_RANGE                    0.0F                                            ///< Minimum valid range on pressure reading.
 #define MAX_VALID_PRESSURE_RANGE                    200.0F                                          ///< Maximum valid range on pressure reading.
 
-#define MIN_INLET_WATER_PRESSURE                    25                                              ///< Minimum water input pressure.
+#define MAX_INLET_WATER_PRESSURE_WARNING_LOW        25.0F                                           ///< Maximum allowed low pressure value.
+#define MIN_INLET_WATER_PRESSURE_WARNING_LOW        28.0F                                           ///< Minimum allowed low pressure value.
+
 #define INLET_WATER_PRESSURE_PERSISTENCE_PERIOD     ( 5 * MS_PER_SECOND )                           ///< Persistence period for pressure out of range error.
 #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.
@@ -117,7 +119,7 @@
     pressuresSelfTestState = PRESSURE_SELF_TEST_STATE_START;
     pressuresDataPublicationTimerCounter = DATA_PUBLISH_COUNTER_START_COUNT;
 
-    initPersistentAlarm( ALARM_ID_INLET_WATER_LOW_PRESSURE, INLET_WATER_PRESSURE_PERSISTENCE_PERIOD, INLET_WATER_PRESSURE_PERSISTENCE_PERIOD );
+    initPersistentAlarm( ALARM_ID_INLET_WATER_PRESSURE_IN_LOW_RANGE, INLET_WATER_PRESSURE_PERSISTENCE_PERIOD, INLET_WATER_PRESSURE_PERSISTENCE_PERIOD );
     initPersistentAlarm( ALARM_ID_INLET_WATER_PRESSURE_FAULT, INLET_WATER_PRESSURE_PERSISTENCE_PERIOD, INLET_WATER_PRESSURE_PERSISTENCE_PERIOD );
 }
 
@@ -132,31 +134,23 @@
 void checkInletPressure( void )
 {
 #ifndef DISABLE_WATER_QUALITY_CHECK
-    F32 const pressure = getMeasuredDGPressure( PRESSURE_SENSOR_RO_PUMP_INLET );
-    BOOL const isPressureTooLow = ( pressure < MIN_INLET_WATER_PRESSURE );
+    F32 pressure          = getMeasuredDGPressure( PRESSURE_SENSOR_RO_PUMP_INLET );
+    BOOL isPressureTooLow = ( pressure < MAX_INLET_WATER_PRESSURE_WARNING_LOW ? TRUE : FALSE );
 
-    checkPersistentAlarm( ALARM_ID_INLET_WATER_LOW_PRESSURE, isPressureTooLow, pressure, MIN_INLET_WATER_PRESSURE );
+    // Alarm per PRS 401
+    if ( TRUE == isPressureTooLow )
+    {
+        checkPersistentAlarm( ALARM_ID_INLET_WATER_PRESSURE_IN_LOW_RANGE, isPressureTooLow, pressure, MAX_INLET_WATER_PRESSURE_WARNING_LOW );
+    }
+    else if ( pressure >= MIN_INLET_WATER_PRESSURE_WARNING_LOW )
+    {
+        checkPersistentAlarm( ALARM_ID_INLET_WATER_PRESSURE_IN_LOW_RANGE, FALSE, pressure, MAX_INLET_WATER_PRESSURE_WARNING_LOW );
+    }
 #endif
 }
 
 /*********************************************************************//**
  * @brief
- * The checkInletPressureFault function checks inlet water pressure value
- * and triggers a machine fault when pressure value is out of allowed range.
- * @details Inputs: RO pump inlet pressure sensor value
- * @details Outputs: Triggers pressure fault persistent alarm
- * @return none
- *************************************************************************/
-void checkInletPressureFault( void )
-{
-    F32 const pressure = getMeasuredDGPressure( PRESSURE_SENSOR_RO_PUMP_INLET );
-    BOOL const isPressureTooLow = ( pressure < MIN_INLET_WATER_PRESSURE );
-
-    checkPersistentAlarm( ALARM_ID_INLET_WATER_PRESSURE_FAULT, isPressureTooLow, pressure, MIN_INLET_WATER_PRESSURE );
-}
-
-/*********************************************************************//**
- * @brief
  * The getMeasuredArterialPressure function gets the current arterial pressure.
  * @details Inputs: arterialPressure
  * @details Outputs: none