Index: firmware/App/Services/Reservoirs.c
===================================================================
diff -u -ra9315539f527b92523b1598ff91e47db4d71dae2 -rc7ed4f90b600fe684097654f150e4972646ffec9
--- firmware/App/Services/Reservoirs.c	(.../Reservoirs.c)	(revision a9315539f527b92523b1598ff91e47db4d71dae2)
+++ firmware/App/Services/Reservoirs.c	(.../Reservoirs.c)	(revision c7ed4f90b600fe684097654f150e4972646ffec9)
@@ -318,7 +318,11 @@
             fillVolumeTargetMl.data = fillToVolMl;
             cmdResponse.rejected    = FALSE;
 
-            requestNewOperationMode( DG_MODE_FILL );
+            if ( ( FALSE == isAlarmActive( ALARM_ID_DG_ACID_BOTTLE_LOW_VOLUME ) ) ||    // reject moving to fill mode if
+                 ( FALSE == isAlarmActive( ALARM_ID_DG_BICARB_BOTTLE_LOW_VOLUME ) ) )   // alarm is active
+            {
+                requestNewOperationMode( DG_MODE_FILL );
+            }
         }
         else
         {