Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -r0c296cef29037819be204c45a23d4d38a52b2718 -rd32847d87534b3273deb7362f598aba60877e7b8
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 0c296cef29037819be204c45a23d4d38a52b2718)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision d32847d87534b3273deb7362f598aba60877e7b8)
@@ -7,8 +7,8 @@
 *
 * @file    ModeStandby.c
 *
-* @author  (last)      Dara Navaei
-* @date    (last)      27-Sep-2022
+* @author  (last)      Bill Bracken
+* @date    (last)      30-Nov-2022
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
@@ -60,6 +60,7 @@
 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 pendingStartDGChemicalDisinfectFlushRequest;                                ///< Flag indicating HD has requested DG start chemical disinfect flush.
 
 static OVERRIDE_U32_T filterFlushTimePeriod = { FILTER_FLUSH_TIME_MS,
                                                 FILTER_FLUSH_TIME_MS, 0, 0 };           ///< Filter flush time period in ms.
@@ -199,21 +200,23 @@
     else if ( TRUE == pendingStartDGFlushRequest )
     {
         pendingStartDGFlushRequest = FALSE;
-
         requestNewOperationMode( DG_MODE_FLUS );
     }
     else if ( TRUE == pendingStartDGHeatDisinfectRequest )
     {
         pendingStartDGHeatDisinfectRequest = FALSE;
-
         requestNewOperationMode( DG_MODE_HEAT );
     }
     else if ( TRUE == pendingStartDGChemicalDisinfectRequest )
     {
         pendingStartDGChemicalDisinfectRequest = FALSE;
-
         requestNewOperationMode( DG_MODE_CHEM );
     }
+    else if ( TRUE == pendingStartDGChemicalDisinfectFlushRequest )
+    {
+        pendingStartDGChemicalDisinfectFlushRequest = FALSE;
+        requestNewOperationMode( DG_MODE_CHFL );
+    }
 
     return state;
 }
@@ -309,6 +312,7 @@
     {
         stopSampleWaterRequest = FALSE;
         setValveState( VSP, VALVE_STATE_CLOSED );
+        setValveState( VPI, VALVE_STATE_CLOSED );
         state = DG_STANDBY_MODE_STATE_FLUSH_FILTER_IDLE;
     }
 
@@ -547,6 +551,61 @@
 
 /*********************************************************************//**
  * @brief
+ * The startDGChemicalDisinfectFlush function starts chemical disinfect flush mode.
+ * @details Inputs: standbyState
+ * @details Outputs: none
+ * @return: TRUE if the switch was successful
+ *************************************************************************/
+BOOL startDGChemicalDisinfectFlush( void )
+{
+    BOOL status = FALSE;
+    DG_CMD_RESPONSE_T cmdResponse;
+
+    cmdResponse.commandID  = DG_CMD_START_CHEM_DISINFECT_FLUSH;
+    cmdResponse.rejected   = FALSE;
+    cmdResponse.rejectCode = DG_CMD_REQUEST_REJECT_REASON_NONE;
+
+    // If DG is in standby mode and the standby mode is in Idle, request chemical disinfect flush
+    // Chemical disinfect flush cannot be run in solo mode because the user has to confirm that the acid is inserted or removed
+    if ( ( DG_MODE_STAN == getCurrentOperationMode() ) && ( DG_STANDBY_MODE_STATE_IDLE == standbyState ) )
+    {
+        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;
+        }
+#endif
+
+        // When chemical disinfect flush is about to be started, both caps must be closed
+        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
+        {
+            pendingStartDGChemicalDisinfectFlushRequest = TRUE;
+            status                                      = TRUE;
+        }
+    }
+    else
+    {
+        cmdResponse.rejected   = TRUE;
+        cmdResponse.rejectCode = REQUEST_REJECT_REASON_DG_NOT_IN_STANDBY_IDLE_STATE;
+    }
+
+    sendCommandResponseMsg( &cmdResponse );
+
+    return status;
+}
+
+/*********************************************************************//**
+ * @brief
  * The getCurrentStandbyState function returns the current state of standby mode.
  * @details Inputs: standbyState
  * @details Outputs: none