Index: firmware/App/Modes/ModeHeatDisinfectActiveCool.c
===================================================================
diff -u -rda0deea71ed5770d98a00943369b9c17321e139f -r704415d4a27cdff6d2cdc9c3641477ee7ccde6af
--- firmware/App/Modes/ModeHeatDisinfectActiveCool.c	(.../ModeHeatDisinfectActiveCool.c)	(revision da0deea71ed5770d98a00943369b9c17321e139f)
+++ firmware/App/Modes/ModeHeatDisinfectActiveCool.c	(.../ModeHeatDisinfectActiveCool.c)	(revision 704415d4a27cdff6d2cdc9c3641477ee7ccde6af)
@@ -73,6 +73,10 @@
 #define RSRVR_ACTIVE_COOL_BELOW_TARGET_TEMP_TIMEOUT_MS  ( 15 * MS_PER_SECOND )                                      ///< Reservoir active cool temperature below target timeout in milliseconds.
 #define RSRVR_ACTIVE_COOL_TARGET_TEMP_TIMEOUT_MS        ( 10 * SEC_PER_MIN * MS_PER_SECOND )                        ///< Reservoir active cool target temperature met in milliseconds.
 
+// Complete states, de-pressurize the concentrate lines
+#define ACID_BICARB_DEPRESSURIZE_TUBING_SPEED_MLPM      20.0F                                                       ///< Acid and bicarb de-pressurize tubing speed in mL/min.
+#define ACID_BICARB_DEPRESSURIZE_TUBING_TIMEOUT_MS      ( 5 * MS_PER_SECOND )                                       ///< Acid and bicarb de-pressurize tubing timeout in milliseconds.
+
 /// Non-volatile write structure
 typedef struct
 {
@@ -576,11 +580,15 @@
 {
     DG_HEAT_DISINFECT_ACTIVE_COOL_STATE_T state = DG_HEAT_DISINFECT_ACTIVE_COOL_STATE_COMPLETE;
 
-    writeDisinfectDataToNV( USAGE_INFO_HEAT_DIS_ACTIVE_COOL );
-
-    if ( TRUE == disinfectNVOps.hasDisStatusBeenWrittenToNV )
+    if ( TRUE == didTimeout( stateStartTimeMS, ACID_BICARB_DEPRESSURIZE_TUBING_TIMEOUT_MS ) )
     {
-        stopDGHeatDisinfectActiveCool();
+        deenergizeActuators( NO_PARK_CONC_PUMPS );
+        writeDisinfectDataToNV( USAGE_INFO_HEAT_DIS_ACTIVE_COOL );
+
+        if ( TRUE == disinfectNVOps.hasDisStatusBeenWrittenToNV )
+        {
+            stopDGHeatDisinfectActiveCool();
+        }
     }
 
     return state;
@@ -1035,10 +1043,37 @@
             setDrainPumpTargetRPM( RSRVR_DRAIN_TARGET_RPM );
             break;
 
+        case DG_HEAT_DISINFECT_ACTIVE_COOL_STATE_COMPLETE:
+            // Valves
+            setValveState( VPI, VALVE_STATE_CLOSED );
+            setValveState( VBF, VALVE_STATE_CLOSED );
+            setValveState( VSP, VALVE_STATE_CLOSED );
+            setValveState( VPD, VALVE_STATE_DRAIN_C_TO_NO );
+            setValveState( VPO, VALVE_STATE_NOFILL_C_TO_NO );
+            setValveState( VDR, VALVE_STATE_DRAIN_C_TO_NO );
+            setValveState( VRC, VALVE_STATE_DRAIN_C_TO_NO );
+            setValveState( VRO, VALVE_STATE_R1_C_TO_NO );
+            setValveState( VRD1, VALVE_STATE_CLOSED );
+            setValveState( VRD2, VALVE_STATE_CLOSED );
+            setValveState( VRI, VALVE_STATE_R1_C_TO_NO );
+            setValveState( VRF, VALVE_STATE_R2_C_TO_NO );
+            // UV reactors
+            turnOffUVReactor( INLET_UV_REACTOR );
+            turnOffUVReactor( OUTLET_UV_REACTOR );
+            // Concentrate pumps
+            setConcentratePumpTargetSpeed( CONCENTRATEPUMPS_CP1_ACID, ACID_BICARB_DEPRESSURIZE_TUBING_SPEED_MLPM );
+            setConcentratePumpTargetSpeed( CONCENTRATEPUMPS_CP2_BICARB, ACID_BICARB_DEPRESSURIZE_TUBING_SPEED_MLPM );
+            requestConcentratePumpOn( CONCENTRATEPUMPS_CP1_ACID );
+            requestConcentratePumpOn( CONCENTRATEPUMPS_CP2_BICARB );
+            // RO pump
+            signalROPumpHardStop();
+            // Drain pump
+            signalDrainPumpHardStop();
+            break;
+
         case DG_HEAT_DISINFECT_ACTIVE_COOL_STATE_START:
         case DG_HEAT_DISINFECT_ACTIVE_COOL_CANCEL_WATER_PATH_STATE:
         case DG_HEAT_DISINFECT_ACTIVE_COOL_CANCEL_BASIC_PATH_STATE:
-        case DG_HEAT_DISINFECT_ACTIVE_COOL_STATE_COMPLETE:
             // De-energize the actuators in the state upon transitioning to these states
             deenergizeActuators( NO_PARK_CONC_PUMPS );
             break;
@@ -1343,14 +1378,14 @@
 
             rsrvrsStatus.rsrvr[ switchRsrvrID ].rStatus = DG_RESERVOIR_ABOVE_TARGET;
             state                                       = DG_HEAT_DISINFECT_ACTIVE_COOL_DRAIN_R2_STATE;
-            setHeatDisinfectActiveCoolActuators( state );
         }
         else if ( DG_HEAT_DISINFECT_ACTIVE_COOL_DRAIN_R2_STATE == state )
         {
-            deenergizeActuators( NO_PARK_CONC_PUMPS );
             state = DG_HEAT_DISINFECT_ACTIVE_COOL_STATE_COMPLETE;
         }
 
+        // Set the actuators state after setting the next state
+        setHeatDisinfectActiveCoolActuators( state );
         stateStartTimeMS = getMSTimerCount();
     }