diff --git a/monitor/fan.cpp b/monitor/fan.cpp
index 4b84fff..3b12905 100644
--- a/monitor/fan.cpp
+++ b/monitor/fan.cpp
@@ -61,8 +61,12 @@
         }
         catch (InvalidSensorError& e)
         {
-            // mark associated fan as nonfunctional
-            updateInventory(false);
+            // Count the number of failed tach sensors
+            if (++_numFailedSensor >= _numSensorFailsForNonFunc)
+            {
+                // Mark associated fan as nonfunctional
+                updateInventory(false);
+            }
         }
     }