Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -r6499ea25921fcf67826fa0c35bb03caf411ba542 -re107dacab9f6c78574f1c26e1004e0dbdc8dba03
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 6499ea25921fcf67826fa0c35bb03caf411ba542)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision e107dacab9f6c78574f1c26e1004e0dbdc8dba03)
@@ -611,23 +611,20 @@
         cmdResponse.commandID  = DG_CMD_START_CHEM_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;
         }
 #endif
 
-        // When chemical disinfect is about to be started, both caps must be closed
-        if ( ( STATE_OPEN == concCap ) || ( STATE_OPEN == diaCap ) )
+        // When chemical disinfect is about to be started, dialysate caps must be closed
+        if ( 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 );
+            cmdResponse.rejectCode = REQUEST_REJECT_REASON_DG_DIALYSATE_CAP_OPEN;
        }
         else
         {
@@ -661,23 +658,20 @@
     // 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 ) )
+        // When chemical disinfect flush is about to be started, dialysate cap must be closed
+        if ( 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 );
+            cmdResponse.rejectCode = REQUEST_REJECT_REASON_DG_DIALYSATE_CAP_OPEN;
         }
         else
         {