Index: firmware/App/Controllers/DialOutFlow.c
===================================================================
diff -u -r27a68f930508638f2eb6265ebb381c8918cbc37b -rd7e01dce5b2ebb1ea02832a9ced81550a919b67b
--- firmware/App/Controllers/DialOutFlow.c	(.../DialOutFlow.c)	(revision 27a68f930508638f2eb6265ebb381c8918cbc37b)
+++ firmware/App/Controllers/DialOutFlow.c	(.../DialOutFlow.c)	(revision d7e01dce5b2ebb1ea02832a9ced81550a919b67b)
@@ -261,7 +261,7 @@
     // Direction change while pump is running is not allowed
     if ( ( FALSE == isDialOutPumpOn ) || ( 0 == flowRate ) || ( dir == dialOutPumpDirectionSet ) )
     {
-        F32 pwmDC = DOP_PWM_FROM_ML_PER_MIN( (F32)flowRate );
+        F32 pwmDC = ( 0 == flowRate ? DOP_PWM_ZERO_OFFSET : DOP_PWM_FROM_ML_PER_MIN( (F32)flowRate ) );
 
         // Don't interrupt pump control unless rate or mode is changing
         if ( ( fabs( pwmDC - dialOutPumpPWMDutyCyclePct ) > NEARLY_ZERO ) || ( mode != dialOutPumpControlMode ) )
@@ -1334,7 +1334,14 @@
         }
         if ( ctrlMode < NUM_OF_PUMP_CONTROL_MODES )
         {
-            result = setDialOutPumpTargetRate( abs(value), dir, (PUMP_CONTROL_MODE_T)ctrlMode );
+            if ( 0 == value )
+            {
+                signalDialOutPumpHardStop();
+            }
+            else
+            {
+                result = setDialOutPumpTargetRate( abs(value), dir, (PUMP_CONTROL_MODE_T)ctrlMode );
+            }
         }
     }