Index: firmware/App/Controllers/DialInFlow.c
===================================================================
diff -u -rda838b2d59d8b12a239cd31f8b68b2b1bf78e4ae -rd4c8e0246e5bc34d1ef6a2e1709647716c84a378
--- firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision da838b2d59d8b12a239cd31f8b68b2b1bf78e4ae)
+++ firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision d4c8e0246e5bc34d1ef6a2e1709647716c84a378)
@@ -952,7 +952,7 @@
         U16 incDelta = ( dipMotorHallSensorCount >= dipLastMotorHallSensorCounts[ nextIdx ] ? \
                          dipMotorHallSensorCount - dipLastMotorHallSensorCounts[ nextIdx ] : \
                          ( HEX_64_K - dipLastMotorHallSensorCounts[ nextIdx ] ) + dipMotorHallSensorCount );
-        U16 decDelta = HEX_64_K - incDelta;
+        U16 decDelta = ( 0 == incDelta ? 0xFFFF : HEX_64_K - incDelta );
         U16 delta;
 
         // Determine dialysate inlet pump speed/direction from delta hall sensor count since last interval