Index: firmware/App/Modes/ModeFill.c
===================================================================
diff -u -r0dc0ea11f55be52283cbe40020d097ade139bc57 -rc6e110b6a0b013d392efea4716eb0b9d58086040
--- firmware/App/Modes/ModeFill.c	(.../ModeFill.c)	(revision 0dc0ea11f55be52283cbe40020d097ade139bc57)
+++ firmware/App/Modes/ModeFill.c	(.../ModeFill.c)	(revision c6e110b6a0b013d392efea4716eb0b9d58086040)
@@ -617,7 +617,7 @@
 {
     DG_FILL_MODE_STATE_T result = DG_FILL_MODE_STATE_TEST_INLET_WATER;
 
-    if ( ( TRUE == isConcPumpParkInProgress( CONCENTRATEPUMPS_CP1_ACID ) ) && ( TRUE == isConcPumpParkInProgress( CONCENTRATEPUMPS_CP2_BICARB ) ) )
+    if ( ( isConcPumpParkInProgress( CONCENTRATEPUMPS_CP1_ACID ) != TRUE ) && ( isConcPumpParkInProgress( CONCENTRATEPUMPS_CP2_BICARB ) ) != TRUE )
     {
         // If this is the first fill of a treatment, prime acid and bicarb lines, otherwise transition
         // to dialysate production directly