Index: firmware/App/Modes/ModeChemicalDisinfect.c
===================================================================
diff -u -r3d131237935eb36e56e0d057a713430e31dc6405 -r4c311b6a51ebcc48a900bacee5cd881c358f68f6
--- firmware/App/Modes/ModeChemicalDisinfect.c	(.../ModeChemicalDisinfect.c)	(revision 3d131237935eb36e56e0d057a713430e31dc6405)
+++ firmware/App/Modes/ModeChemicalDisinfect.c	(.../ModeChemicalDisinfect.c)	(revision 4c311b6a51ebcc48a900bacee5cd881c358f68f6)
@@ -422,7 +422,12 @@
     resetReservoirsLowestWeight();
 
     F32 ppiPressure = getMeasuredDGPressure( PRESSURE_SENSOR_RO_PUMP_INLET );
-    F32 THdTemp     = getTemperatureValue( TEMPSENSORS_OUTLET_REDUNDANT );  //TODo change to Thd
+#ifdef THD_USING_TRO_CONNECTOR
+    // THd is connected to TRo in V3
+    F32 THdTemp     = getTemperatureValue( TEMPSENSORS_OUTLET_REDUNDANT );
+#else
+    F32 THdTemp     = getTemperatureValue( TEMPSENSORS_HEAT_DISINFECT );
+#endif
     F32 TPoTemp     = getTemperatureValue( TEMPSENSORS_OUTLET_PRIMARY_HEATER );
 
     // If the inlet pressure is less than the threshold and TDi and TRo difference is greater than 3 C, the cycle should be canceled
@@ -651,7 +656,12 @@
     // Check if the flush circulation time has elapsed and the temperature sensors are not in range yet
     if ( ( TRUE == didTimeout( stateTimer, FLUSH_CICRCULATION_WAIT_TIME_MS ) ) && ( FALSE == areTempSensorsInRange ) )
     {
-        F32 ThdTemp = getTemperatureValue( TEMPSENSORS_OUTLET_REDUNDANT ); // TODO add THd later. This is the new temp sensor of the coldest spot.
+#ifdef THD_USING_TRO_CONNECTOR
+        // THd is connected to TRo in V3
+        F32 ThdTemp = getTemperatureValue( TEMPSENSORS_OUTLET_REDUNDANT );
+#else
+        F32 ThdTemp = getTemperatureValue( TEMPSENSORS_HEAT_DISINFECT );
+#endif
         F32 TPoTemp = getTemperatureValue( TEMPSENSORS_OUTLET_PRIMARY_HEATER );
         F32 TD1Temp = getTemperatureValue( TEMPSENSORS_CONDUCTIVITY_SENSOR_1 );
         F32 TD2Temp = getTemperatureValue( TEMPSENSORS_CONDUCTIVITY_SENSOR_2 );
@@ -1927,8 +1937,11 @@
 {
     CHEM_DISINFECT_STATUS_T status = CHEM_DISINFECT_IN_PROGRESS;
 
-    F32 ThdTemp = getTemperatureValue( TEMPSENSORS_OUTLET_REDUNDANT ); //TODO change this to actual THd sensor later
-
+#ifdef THD_USING_TRO_CONNECTOR
+    F32 ThdTemp = getTemperatureValue( TEMPSENSORS_OUTLET_REDUNDANT );
+#else
+    F32 ThdTemp = getTemperatureValue( TEMPSENSORS_HEAT_DISINFECT );
+#endif
     BOOL isR1OutOfRange = fabs( getLoadCellSmallFilteredWeight( LOAD_CELL_RESERVOIR_1_PRIMARY ) - R1ChemDisinfectVol ) > RSRVRS_MAX_TARGET_VOL_CHANGE_ML;
     BOOL isR2OutOfRange = fabs( getLoadCellSmallFilteredWeight( LOAD_CELL_RESERVOIR_2_PRIMARY ) - R2ChemDisinfectVol ) > RSRVRS_MAX_TARGET_VOL_CHANGE_ML;