Index: firmware/App/Services/Reservoirs.c
===================================================================
diff -u -r025612ad77fe630889a364586de54bffe5262d56 -r44e6ff492574b4670c5dd80db58b17ba36d2805e
--- firmware/App/Services/Reservoirs.c	(.../Reservoirs.c)	(revision 025612ad77fe630889a364586de54bffe5262d56)
+++ firmware/App/Services/Reservoirs.c	(.../Reservoirs.c)	(revision 44e6ff492574b4670c5dd80db58b17ba36d2805e)
@@ -311,7 +311,11 @@
             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
         {