Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -rd48e02f028dbd430bedda41be0173fbfc45116d7 -r5d3e28c19ae10a99a5ce1fc5c010ac944975a6a1
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision d48e02f028dbd430bedda41be0173fbfc45116d7)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 5d3e28c19ae10a99a5ce1fc5c010ac944975a6a1)
@@ -61,6 +61,7 @@
 static BOOL pendingStartDGFlushRequest;                                                 ///< Flag indicating HD has requested DG start flush.
 static BOOL pendingStartDGHeatDisinfectRequest;                                         ///< Flag indicating HD has requested DG start heat disinfect.
 static BOOL pendingStartDGChemicalDisinfectRequest;                                     ///< Flag indicating HD has requested DG start chemical disinfect.
+static BOOL pendingStartDGHeatDisinfectActiveCoolRequest;                               ///< Flag indicating HD has requested DG start heat disinfect active cool.
 
 static OVERRIDE_U32_T filterFlushTimePeriod = { FILTER_FLUSH_TIME_MS,
                                                 FILTER_FLUSH_TIME_MS, 0, 0 };           ///< Filter flush time period in ms.
@@ -78,23 +79,25 @@
  * @details Inputs: none
  * @details Outputs: standbyState, stopSampleWaterRequest, startSampleWaterRequest,
  * flushFilterRequest, endSampleWaterRequest, waterSampleStartTime,
- * filterFlushStartTime, filterFlushPublishTimerCounter, pendingStartDGRequest
+ * filterFlushStartTime, filterFlushPublishTimerCounter, pendingStartDGRequest,
+ * pendingStartDGHeatDisinfectActiveCoolRequest
  * @return none
  *************************************************************************/
 void initStandbyMode( void )
 {
-    standbyState                           = DG_STANDBY_MODE_STATE_IDLE;
-    stopSampleWaterRequest                 = FALSE;
-    startSampleWaterRequest                = FALSE;
-    flushFilterRequest                     = FALSE;
-    endSampleWaterRequest                  = FALSE;
-    waterSampleStartTime                   = 0;
-    filterFlushStartTime                   = 0;
-    filterFlushPublishTimerCounter         = 0;
-    pendingStartDGRequest                  = FALSE;
-    pendingStartDGFlushRequest             = FALSE;
-    pendingStartDGHeatDisinfectRequest     = FALSE;
-    pendingStartDGChemicalDisinfectRequest = FALSE;
+    standbyState                                 = DG_STANDBY_MODE_STATE_IDLE;
+    stopSampleWaterRequest                       = FALSE;
+    startSampleWaterRequest                      = FALSE;
+    flushFilterRequest                           = FALSE;
+    endSampleWaterRequest                        = FALSE;
+    waterSampleStartTime                         = 0;
+    filterFlushStartTime                         = 0;
+    filterFlushPublishTimerCounter               = 0;
+    pendingStartDGRequest                        = FALSE;
+    pendingStartDGFlushRequest                   = FALSE;
+    pendingStartDGHeatDisinfectRequest           = FALSE;
+    pendingStartDGChemicalDisinfectRequest       = FALSE;
+    pendingStartDGHeatDisinfectActiveCoolRequest = FALSE;
 
     // Reset the heaters efficiency for another treatment
     resetHeatersEstimationGain();
@@ -215,7 +218,13 @@
 
         requestNewOperationMode( DG_MODE_CHEM );
     }
+    else if ( TRUE == pendingStartDGHeatDisinfectActiveCoolRequest )
+    {
+        pendingStartDGHeatDisinfectActiveCoolRequest = FALSE;
 
+        requestNewOperationMode( DG_MODE_HCOL );
+    }
+
     return state;
 }
 
@@ -520,6 +529,66 @@
 
 /*********************************************************************//**
  * @brief
+ * The startDGHeatDisinfectActiveCool function starts heat disinfect active
+ * cool mode.
+ * @details Inputs: standbyState
+ * @details Outputs: none
+ * @return: TRUE if the switch was successful
+ *************************************************************************/
+BOOL startDGHeatDisinfectActiveCool( void )
+{
+    BOOL status = FALSE;
+
+    // If DG is in standby mode and the standby mode is in Idle state or if DG is in solo mode, request DG heat disinfect
+    if ( ( DG_MODE_STAN == getCurrentOperationMode() ) && ( DG_STANDBY_MODE_STATE_IDLE == standbyState ) || ( DG_MODE_SOLO == getCurrentOperationMode() ) )
+    {
+        DG_CMD_RESPONSE_T cmdResponse;
+        DG_USAGE_INFO_RECORD_T usageInfo;
+
+        getNVRecord2Driver( GET_USAGE_RECORD, (U08*)&usageInfo, sizeof( DG_USAGE_INFO_RECORD_T ), 0, ALARM_ID_NO_ALARM );
+
+        cmdResponse.commandID   = DG_CMD_START_HEAT_DISINFECT;
+        cmdResponse.rejected    = FALSE;
+        cmdResponse.rejectCode  = DG_CMD_REQUEST_REJECT_REASON_NONE;
+        OPN_CLS_STATE_T concCap = getSwitchStatus( CONCENTRATE_CAP );
+        OPN_CLS_STATE_T diaCap  = getSwitchStatus( DIALYSATE_CAP );
+
+#ifndef _RELEASE_
+        if ( SW_CONFIG_ENABLE_VALUE == getSoftwareConfigStatus( SW_CONFIG_DISABLE_CAPS_MONITOR ) )
+        {
+            concCap = STATE_CLOSED;
+            diaCap  = STATE_CLOSED;
+            // Using the caps switch to disable the chemical disinfect date checks
+            usageInfo.lastChemDisFlushCompleteDateEpoch = 40;
+            usageInfo.lastChemDisCompleteDateEpoch      = 32;
+        }
+#endif
+
+        if ( ( STATE_OPEN == concCap ) || ( STATE_OPEN == diaCap ) )
+        {
+            cmdResponse.rejected   = TRUE;
+            cmdResponse.rejectCode = ( STATE_OPEN == getSwitchStatus( DIALYSATE_CAP ) ? REQUEST_REJECT_REASON_DG_DIALYSATE_CAP_OPEN :
+                                                                                        REQUEST_REJECT_REASON_DG_CONCENTRATE_CAP_OPEN );
+        }
+        else if ( usageInfo.lastChemDisFlushCompleteDateEpoch < usageInfo.lastChemDisCompleteDateEpoch )
+        {
+            cmdResponse.rejected   = TRUE;
+            cmdResponse.rejectCode = REQUEST_REJECT_REASON_DG_CHEM_FLUSH_NOT_COMPLETED;
+        }
+        else
+        {
+            pendingStartDGHeatDisinfectActiveCoolRequest = TRUE;
+            status                                       = TRUE;
+        }
+
+        sendCommandResponseMsg( &cmdResponse );
+    }
+
+    return status;
+}
+
+/*********************************************************************//**
+ * @brief
  * The startDGChemicalDisinfect function starts chemical disinfect mode.
  * @details Inputs: standbyState
  * @details Outputs: none