Index: firmware/App/Services/TDInterface.c
===================================================================
diff -u -rc554353ba10c84377f0b9f7218f911543a293598 -r07340ea19b917f515c85e42c7904c748aa7c7dcf
--- firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision c554353ba10c84377f0b9f7218f911543a293598)
+++ firmware/App/Services/TDInterface.c	(.../TDInterface.c)	(revision 07340ea19b917f515c85e42c7904c748aa7c7dcf)
@@ -351,6 +351,11 @@
             fpReason = signalStartGenPermeate();
             // start pre-gen dialysate
             result = requestDDPreGenStart();
+
+            if ( REQUEST_REJECT_REASON_NONE != fpReason )
+            {
+                result = FALSE;
+            }
             // Update Temperature, Acid/Bicarb type and dialysate rate for pregen process.
             setTDDialysateFlowrate( startPreGenRequest.dialRate );
             setTDTargetDialysateTemperature( startPreGenRequest.dialTemp );
@@ -364,6 +369,11 @@
                 result = requestDDPreGenStop();
                 // stop FP Pre-Generate Permeate
                 fpReason = signalStopGenPermeate();
+
+                if ( REQUEST_REJECT_REASON_NONE != fpReason )
+                {
+                    result = FALSE;
+                }
             }
         }
     }
@@ -419,6 +429,11 @@
                 result = requestDDGenDialyasteStop();
                 // stop FP Pre-Generate Permeate
                 fpReason = signalStopGenPermeate();
+
+                if ( REQUEST_REJECT_REASON_NONE != fpReason )
+                {
+                    result = FALSE;
+                }
             }
             else
             {