Index: firmware/App/Modes/ModeGenDialysate.c
===================================================================
diff -u -re163e9faf44d2eb475188b8ea4d6a3befb6e753f -r7f97b34440ff591f75dbedb9ae3284ced36e73b7
--- firmware/App/Modes/ModeGenDialysate.c	(.../ModeGenDialysate.c)	(revision e163e9faf44d2eb475188b8ea4d6a3befb6e753f)
+++ firmware/App/Modes/ModeGenDialysate.c	(.../ModeGenDialysate.c)	(revision 7f97b34440ff591f75dbedb9ae3284ced36e73b7)
@@ -7,8 +7,8 @@
 *
 * @file    ModeGenDialysate.c
 *
-* @author  (last)      Michael Garthwaite
-* @date    (last)      29-Jan-2026
+* @author  (last)      Sameer Kalliadan Poyil
+* @date    (last)      06-Feb-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  06-Nov-2024
@@ -62,7 +62,7 @@
 #define LOW_DIAL_FLOW_RATE                              150.0F                                      ///< Dialysate flow rate lesser than 150 considered to be low Qds.
 #define ZERO_DIAL_FLOW_RATE                             0.0F                                        ///< Zero dialysate flow rate
 #define SPENT_CHAMBER_FILL_MAX_COUNT                    10                                          ///< Total number of spent chamber fill allowed.
-#define BICARB_CHAMBER_FILL_TIMEOUT                    ( 1 * MS_PER_SECOND )                        ///< Bicarb chamber fill timeout.
+#define BICARB_CHAMBER_FILL_TIMEOUT                     ( 1 * MS_PER_SECOND )                       ///< Bicarb chamber fill timeout.
 //Testing
 #define DELAY_BC_SWITCHING_AT_START_UP          ( 10 * MS_PER_SECOND )                              ///< Provide a balancing chamber switching start up delay to stabilize pump speed etc.,
 /// Payload record structure for Gen dialysate execution state set request
@@ -216,10 +216,19 @@
             setValveState( D35_VALV, VALVE_STATE_CLOSED );  // VDI
             setValveState( D40_VALV, VALVE_STATE_CLOSED );  // VDO
             setValveState( D47_VALV, VALVE_STATE_CLOSED );  // spent chamber purge valve
-            setValveState( D64_VALV, VALVE_STATE_CLOSED );
             setValveState( D34_VALV, VALVE_STATE_OPEN );    // Bypass valve
-            setValveState( D80_VALV, VALVE_STATE_OPEN );    // Bicarb valve
+            setValveState( D8_VALV, VALVE_STATE_CLOSED );
+            setValveState( D54_VALV, VALVE_STATE_CLOSED );
+            setValveState( D81_VALV, VALVE_STATE_CLOSED );
+            setValveState( D85_VALV, VALVE_STATE_CLOSED );
+            setValveState( D31_VALV, VALVE_STATE_CLOSED );
 
+            if ( getTestConfigStatus( TEST_CONFIG_DD_ENABLE_DRY_BICARB ) == FALSE )
+            {
+                setValveState( D80_VALV, VALVE_STATE_OPEN );    // Bicarb valve
+                setValveState( D64_VALV, VALVE_STATE_CLOSED );
+            }
+
             // Turn on the primary heater
             calculateTargetDialysateTemp();
             setHeaterTargetTemperature( D5_HEAT, getGenDialysateTargetTemperature() );
@@ -249,7 +258,11 @@
         case DD_GEND_DIALYSATE_DELIVERY_STATE:
             //Previous state
             setValveState( D47_VALV, VALVE_STATE_CLOSED );  // spent chamber purge valve
-            setValveState( D64_VALV, VALVE_STATE_CLOSED );
+            setValveState( D8_VALV, VALVE_STATE_CLOSED );
+            setValveState( D54_VALV, VALVE_STATE_CLOSED );
+            setValveState( D81_VALV, VALVE_STATE_CLOSED );
+            setValveState( D85_VALV, VALVE_STATE_CLOSED );
+            setValveState( D31_VALV, VALVE_STATE_CLOSED );
             setValveState( D14_VALV, VALVE_STATE_OPEN );
             setValveState( D53_VALV, VALVE_STATE_OPEN );    // Drain valve
 
@@ -275,17 +288,33 @@
             setValveState( D34_VALV, VALVE_STATE_CLOSED );  // Bypass valve
             setValveState( D35_VALV, VALVE_STATE_OPEN );    // VDI
             setValveState( D40_VALV, VALVE_STATE_OPEN );    // VDO
-            setValveState( D80_VALV, VALVE_STATE_OPEN );    // Bicarb valve
+
+            if ( getTestConfigStatus( TEST_CONFIG_DD_ENABLE_DRY_BICARB ) == FALSE )
+            {
+                setValveState( D80_VALV, VALVE_STATE_OPEN );    // Bicarb valve
+                setValveState( D64_VALV, VALVE_STATE_CLOSED );
+            }
             break;
 
         case DD_GEND_SPENT_CHAMBER_FILL_STATE:
             //Set valves and actuators
             setValveState( D35_VALV, VALVE_STATE_CLOSED );  // VDI
             setValveState( D40_VALV, VALVE_STATE_CLOSED );  // VDO
+            setValveState( D8_VALV, VALVE_STATE_CLOSED );
+            setValveState( D54_VALV, VALVE_STATE_CLOSED );
+            setValveState( D81_VALV, VALVE_STATE_CLOSED );
+            setValveState( D85_VALV, VALVE_STATE_CLOSED );
+            setValveState( D31_VALV, VALVE_STATE_CLOSED );
             setValveState( D14_VALV, VALVE_STATE_OPEN );
             setValveState( D53_VALV, VALVE_STATE_OPEN );    // Drain valve
             setValveState( D34_VALV, VALVE_STATE_OPEN );    // Bypass valve
-            setValveState( D80_VALV, VALVE_STATE_OPEN );    // Bicarb valve
+
+            if ( getTestConfigStatus( TEST_CONFIG_DD_ENABLE_DRY_BICARB ) == FALSE )
+            {
+                setValveState( D80_VALV, VALVE_STATE_OPEN );    // Bicarb valve
+                setValveState( D64_VALV, VALVE_STATE_CLOSED );
+            }
+
             setValveState( D47_VALV, VALVE_STATE_OPEN );    // Spent chamber purge valve
 
             requestConcentratePumpOff( D76_PUMP, FALSE );
@@ -323,8 +352,13 @@
 
             setValveState( D53_VALV, VALVE_STATE_OPEN );    // Drain valve
             setValveState( D34_VALV, VALVE_STATE_OPEN );    // Bypass valve
-            setValveState( D64_VALV, VALVE_STATE_OPEN );    // Bicarb chamber purge valve
-            setValveState( D80_VALV, VALVE_STATE_OPEN );    // Bicarb valve
+
+            if ( getTestConfigStatus( TEST_CONFIG_DD_ENABLE_DRY_BICARB ) == FALSE )
+            {
+                setValveState( D80_VALV, VALVE_STATE_OPEN );    // Bicarb valve
+                setValveState( D64_VALV, VALVE_STATE_OPEN );    // Bicarb chamber purge valve
+            }
+
             bicarbFillStartTimeMS = getMSTimerCount();
 
             // Turn on the primary heater
@@ -363,7 +397,6 @@
             setValveState( D40_VALV, VALVE_STATE_CLOSED );
             setValveState( D31_VALV, VALVE_STATE_CLOSED );
             setValveState( D47_VALV, VALVE_STATE_CLOSED );
-            setValveState( D64_VALV, VALVE_STATE_CLOSED );
             setValveState( D54_VALV, VALVE_STATE_CLOSED );
             setValveState( D14_VALV, VALVE_STATE_CLOSED );
             setValveState( D52_VALV, VALVE_STATE_CLOSED );
@@ -375,7 +408,12 @@
 
             setValveState( D34_VALV, VALVE_STATE_OPEN );
             setValveState( D53_VALV, VALVE_STATE_OPEN );
-            setValveState( D80_VALV, VALVE_STATE_OPEN );
+
+            if ( getTestConfigStatus( TEST_CONFIG_DD_ENABLE_DRY_BICARB ) == FALSE )
+            {
+                setValveState( D80_VALV, VALVE_STATE_OPEN );
+                setValveState( D64_VALV, VALVE_STATE_CLOSED );
+            }
             break;
 
         case DD_GEND_ISOLATED_UF_STATE: