Index: firmware/App/Controllers/BalancingChamber.c
===================================================================
diff -u -r63e96158c3d4bff91167b2a0656a63f78ede8b41 -r7d7129ebe8a98694bea7cf4118f3bedf62f2157b
--- firmware/App/Controllers/BalancingChamber.c	(.../BalancingChamber.c)	(revision 63e96158c3d4bff91167b2a0656a63f78ede8b41)
+++ firmware/App/Controllers/BalancingChamber.c	(.../BalancingChamber.c)	(revision 7d7129ebe8a98694bea7cf4118f3bedf62f2157b)
@@ -22,6 +22,7 @@
 #include "DryBiCart.h"
 #include "FpgaDD.h"
 #include "Heaters.h"
+#include "Level.h"
 #include "ModeGenDialysate.h"
 #include "ModeStandby.h"
 #include "Messaging.h"
@@ -254,6 +255,8 @@
  *************************************************************************/
 U32 execBalancingChamberControl( void )
 {
+    LVL_STATE_T bicarbChamberLevel        = getBicarbChamberLevelStatus();
+
     updateBalChamberSwitchingPeriod();
 
     // Increment counter indicating fill is in progress.
@@ -262,6 +265,20 @@
 
     if ( ( getTestConfigStatus( TEST_CONFIG_DD_ENABLE_DRY_BICARB ) == TRUE ) && ( balChamberExecState > BAL_CHAMBER_STATE_IDLE ) )
     {
+#ifdef CONDUCTIVE_LEVEL_SENSOR_ENABLED
+        if ( LVL_STATE_LOW == bicarbChamberLevel )
+        {
+            if ( getCurrentBalancingChamberExecState() > BAL_CHAMBER_STATE_IDLE )
+            {
+                if ( FALSE == setBicarbChamberFillRequested() )
+                {
+                    // TODO
+                    //drybicart state machines are combined and so this is not an issue in future
+                    //set alarm ?
+                }
+            }
+        }
+#else // time based chamber F fill
         // Increment counter for dry bicarb chamber fill
         bicarbChamberPeriodicFillCounter += 1;
         // Fill bicarb chamber once every 60secs.
@@ -275,6 +292,7 @@
             }
             bicarbChamberPeriodicFillCounter = 0;
         }
+#endif
     }
 
     switch ( balChamberExecState )