Index: firmware/App/Controllers/DialInFlow.c
===================================================================
diff -u -r3d409ee7130063937dce719281bb072c87023d3f -r0afd6b2cf9e986d314f37fb9bf34ca4fba077266
--- firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision 3d409ee7130063937dce719281bb072c87023d3f)
+++ firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision 0afd6b2cf9e986d314f37fb9bf34ca4fba077266)
@@ -79,8 +79,9 @@
 static const U32 DIP_OFF_ERROR_PERSIST         = ((5 * MS_PER_SECOND) / TASK_PRIORITY_INTERVAL);
 /// Persist time (task intervals) motor speed error condition.
 static const U32 DIP_MOTOR_SPEED_ERROR_PERSIST = ((5 * MS_PER_SECOND) / TASK_PRIORITY_INTERVAL);
-/// Rotor speed persist time test needs a minimum number of rotations.
-static const U32 DIP_ROTOR_ERROR_PERSIST_ROTATION_MIN = 3;
+/// Rotor speed persist time test needs a minimum number of rotations or time.
+static const U32 DIP_ROTOR_ERROR_PERSIST_ROTATION_MIN = 10;
+static const U32 DIP_ROTOR_ERROR_PERSIST_TIME_MIN = (10 * MS_PER_SECOND);
 /// Persist time (task intervals) pump direction error condition.
 static const U32 DIP_DIRECTION_ERROR_PERSIST   = (250 / TASK_PRIORITY_INTERVAL);
 /// Time threshold to trigger an alarm if Dialysate flow data has not arrived within 3 seconds
@@ -1069,15 +1070,17 @@
 U32 getPumpRotorErrorPersistTime( F32 mtr_rpm, F32 gear_ratio )
 {
     U32 err_persist_time = HEX_32_BIT_FULL_SCALE;  // 49 days
-    U32 temporaryPersistentTimeout = 10 * MS_PER_SECOND;
+    F32 absMotRPM = fabs( mtr_rpm );
 
-    if ( mtr_rpm > 0 )
+    if ( absMotRPM > NEARLY_ZERO )
     {
         /// Calculate persist time for rotor speed error condition.
-        err_persist_time = ( ( DIP_ROTOR_ERROR_PERSIST_ROTATION_MIN / ( mtr_rpm / gear_ratio / SEC_PER_MIN ) ) * MS_PER_SECOND );
+        err_persist_time = ( ( (F32)DIP_ROTOR_ERROR_PERSIST_ROTATION_MIN / ( absMotRPM / gear_ratio / (F32)SEC_PER_MIN ) ) * (F32)MS_PER_SECOND );
+        // Choose bigger value of MinTime or calculated persist time
+        err_persist_time = MAX(DIP_ROTOR_ERROR_PERSIST_TIME_MIN, err_persist_time);
     }
 
-   return err_persist_time + temporaryPersistentTimeout;
+   return err_persist_time;
 }
 
 /*********************************************************************//**