Index: firmware/App/Controllers/DialInFlow.c
===================================================================
diff -u -r5cc3d018b1d6e0f0177a69d1e7108af13aaa240a -r708c23e585468515a8467d0056d712b2846b56da
--- firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision 5cc3d018b1d6e0f0177a69d1e7108af13aaa240a)
+++ firmware/App/Controllers/DialInFlow.c	(.../DialInFlow.c)	(revision 708c23e585468515a8467d0056d712b2846b56da)
@@ -1299,13 +1299,22 @@
 
     if ( DFM_SENSOR_PARAM_CORRUPT_STATUS != dfmStatus )
     {
-        dialInFlowCalGain   = cal.hdFlowSensors[ CAL_DATA_HD_DIALYZER_FLOW_SENSOR ].gain;
-        dialInFlowCalOffset = cal.hdFlowSensors[ CAL_DATA_HD_DIALYZER_FLOW_SENSOR ].offset;
-        result = SELF_TEST_STATUS_PASSED;
+#ifndef DISABLE_CAL_CHECK
+        if ( cal.hdFlowSensors[ CAL_DATA_HD_DIALYZER_FLOW_SENSOR ].calibrationTime == 0 )
+        {
+            SET_ALARM_WITH_2_U32_DATA( ALARM_ID_HD_DIALYSATE_FLOW_INVALID_CALIBRATION, cal.hdFlowSensors[ CAL_DATA_HD_DIALYZER_FLOW_SENSOR ].calibrationTime,
+                                       cal.hdFlowSensors[ CAL_DATA_HD_DIALYZER_FLOW_SENSOR ].crc );
+        }
+        else
+#endif
+        {
+            dialInFlowCalGain   = cal.hdFlowSensors[ CAL_DATA_HD_DIALYZER_FLOW_SENSOR ].gain;
+            dialInFlowCalOffset = cal.hdFlowSensors[ CAL_DATA_HD_DIALYZER_FLOW_SENSOR ].offset;
+            result = SELF_TEST_STATUS_PASSED;
+        }
     }
     else
     {
-        result = SELF_TEST_STATUS_FAILED;
         SET_ALARM_WITH_1_U32_DATA( ALARM_ID_HD_DIALYSATE_FLOW_STATUS_SELF_TEST_FAILURE, (U32)dfmStatus );
     }
 
@@ -1316,6 +1325,7 @@
 /*************************************************************************
  *                       TEST SUPPORT FUNCTIONS
  *************************************************************************/
+
 
 /*********************************************************************//**
  * @brief