Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -r3643a2e648ab2b216fd08579e56bdc02fb94836d -rf46f00ed7e9e3d3483c8fb1a4c987bd1691501bb
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision 3643a2e648ab2b216fd08579e56bdc02fb94836d)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision f46f00ed7e9e3d3483c8fb1a4c987bd1691501bb)
@@ -7,8 +7,8 @@
 *
 * @file    ModeStandby.c
 *
-* @author  (last)      “rkallala”
-* @date    (last)      09-Dec-2025
+* @author  (last)      “Raghu
+* @date    (last)      04-Feb-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  07-Aug-2024
@@ -18,6 +18,7 @@
 #include "BalancingChamber.h"
 #include "ConcentratePumps.h"
 #include "ConductivitySensors.h"
+#include "FPOperationModes.h"
 #include "Heaters.h"
 #include "ModeFault.h"
 #include "ModeStandby.h"
@@ -157,6 +158,7 @@
 static DD_STANDBY_MODE_STATE_T handleStandbyIdleState( void )
 {
     DD_STANDBY_MODE_STATE_T state = DD_STANDBY_MODE_STATE_IDLE;
+    FP_OP_MODE_T fpMode = getCurrentFPOperationMode();
 
     //Testing
     hydChamberWaterInletControl();
@@ -168,8 +170,17 @@
 //    }
     if ( TRUE == pendingStartDDPreGenRequest )
     {
-        pendingStartDDPreGenRequest = FALSE;
-        requestNewOperationMode( DD_MODE_PREG );
+       // wait for IOFP GENP mode and when IOFP manual control is not set
+       if ( ( FP_MODE_GENP == fpMode ) && ( getTestConfigStatus( TEST_CONFIG_DD_RUN_SOLO ) == FALSE ) )
+       {
+           pendingStartDDPreGenRequest = FALSE;
+           requestNewOperationMode( DD_MODE_PREG );
+       }
+       else if ( getTestConfigStatus( TEST_CONFIG_DD_RUN_SOLO ) == TRUE )
+       {
+           pendingStartDDPreGenRequest = FALSE;
+           requestNewOperationMode( DD_MODE_PREG );
+       }
     }
     //Test request to handle only balancing chamber switching
     else if ( TRUE == pendingBalanceChamberSwOnlyRequest )