Index: firmware/App/Controllers/TemperatureSensors.c
===================================================================
diff -u -r9426334142cbfdea9ee99e3040fc08ff0247da7b -r5e3a46112ebab361a33b9f7cadb619eb12b44c0f
--- firmware/App/Controllers/TemperatureSensors.c	(.../TemperatureSensors.c)	(revision 9426334142cbfdea9ee99e3040fc08ff0247da7b)
+++ firmware/App/Controllers/TemperatureSensors.c	(.../TemperatureSensors.c)	(revision 5e3a46112ebab361a33b9f7cadb619eb12b44c0f)
@@ -93,6 +93,10 @@
 #define BARO_SENSOR_REFERENCE_TEMP_C                            2000                                            ///< Barometric sensor reference temperature in C.
 #define BARO_SENSOR_WAIT_FOR_COEFF_TIME_OUT_MS                  ( 20 * MS_PER_SECOND )                          ///< Barometric sensor wait for coefficients timeout in milliseconds.
 
+#define TDI_TRO_TEMP_SENSORS_MAX_DEVIATION_C                    1.0F                                            ///< Dialysate temperature sensors maximum allowed deviation in C.
+#define DIALYSATE_TEMP_SNSRS_OUT_OF_RANGE_TIMEOUT_MS            ( 10 * MS_PER_SECOND )                          ///< Dialysate temperature sensors drift timeout in milliseconds.
+#define TDI_TRO_TEMP_SENSORS_MAX_DEVIATION_IN_HEAT_DIS_C        3.0F                                            ///< Dialysate temperature sensors maximum allowed deviation in heat disinfect in C.
+
 /// Temperature sensor exec states.
 typedef enum tempSensors_Exec_States
 {
@@ -329,6 +333,7 @@
 
     // Persistent alarm for the temperature sensors range check
     initPersistentAlarm( ALARM_ID_DG_TEMPERATURE_SENSORS_ADC_FAULT, TEMP_SENSORS_OUT_OF_RANGE_TIME_OUT_MS, TEMP_SENSORS_OUT_OF_RANGE_TIME_OUT_MS );
+    initPersistentAlarm( ALARM_ID_DG_DIALYSATE_TEMPERATURE_SENSORS_OUT_OF_RANGE, 0, DIALYSATE_TEMP_SNSRS_OUT_OF_RANGE_TIMEOUT_MS );
 
     // Initialize the FPGA persistent alarms
     initFPGAPersistentAlarm( FPGA_PERS_ERROR_TWO_WIRE_ADC_TEMP_SENSORS, ALARM_ID_DG_TWO_WIRE_SENSORS_FPGA_FAULT, TEMP_SENSORS_FPGA_ERROR_TIMEOUT_MS, TEMP_SENSORS_FPGA_ERROR_TIMEOUT_MS);
@@ -398,6 +403,9 @@
     // Monitor the temperature values
     monitorTemperatureSenors();
 
+    // Check the TDi/TRo drift
+    checkDialysateTemperatureSensors();
+
     // Publish the data
     publishTemperatureSensorsData();
 }
@@ -446,6 +454,10 @@
                     checkPersistentAlarm( ALARM_ID_DG_CLEANING_MODE_INLET_WATER_TEMP_TOO_LOW, isWaterTempInLowRange, temperature, MAX_WATER_TEMPERATURE_WARNING_LOW_RANGE );
                 }
                 break;
+
+            default:
+                // NOTE: Do nothing in the rest of the modes
+                break;
         }
     }
 }
@@ -527,6 +539,31 @@
 
 /*********************************************************************//**
  * @brief
+ * The checkDialysateTemperatureSensors function checks whether the
+ * dialysate temperature sensors have drifted. If they are drifted, it raises
+ * an alarm.
+ * @details Inputs: none
+ * @details Outputs: None
+ * @return none
+ *************************************************************************/
+void checkDialysateTemperatureSensors( void )
+{
+#ifndef _RELEASE_
+    if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_TEMPERATURE_SENSORS_ALARM ) != SW_CONFIG_ENABLE_VALUE )
+#endif
+    {
+        F32 TDi         = getTemperatureValue( TEMPSENSORS_INLET_DIALYSATE );
+        F32 TRo         = getTemperatureValue( TEMPSENSORS_OUTLET_REDUNDANT );
+        DG_OP_MODE_T op = getCurrentOperationMode();
+        F32 driftC      = ( DG_MODE_HEAT == op ? TDI_TRO_TEMP_SENSORS_MAX_DEVIATION_IN_HEAT_DIS_C : TDI_TRO_TEMP_SENSORS_MAX_DEVIATION_C );
+        BOOL isDriftOut = ( fabs( TDi - TRo ) > driftC ? TRUE : FALSE );
+
+        checkPersistentAlarm( ALARM_ID_DG_DIALYSATE_TEMPERATURE_SENSORS_OUT_OF_RANGE, isDriftOut, fabs( TDi - TRo ), driftC );
+    }
+}
+
+/*********************************************************************//**
+ * @brief
  * The getADC2TempConversion function calculates the temperature from the
  * moving average ADC samples.
  * @details Inputs: tempEquationCoeffA, tempEquationCoeffB