diff --git a/FHEM/10_MAX.pm b/FHEM/10_MAX.pm
index 297c9f8f7..074317ea7 100755
--- a/FHEM/10_MAX.pm
+++ b/FHEM/10_MAX.pm
@@ -527,8 +527,9 @@ MAX_Parse($$)
 
     readingsBulkUpdate($shash, "mode", $ctrl_modes[$mode] );
     readingsBulkUpdate($shash, "battery", $batterylow ? "low" : "ok");
-    #This formatting must match with in MAX_Set:$templist
-    readingsBulkUpdate($shash, "desiredTemperature", sprintf("%2.1f",$desiredTemperature));
+    #The formatting of desiredTemperature must match with in MAX_Set:$templist
+    #Sometime we get an MAX_Parse MAX,1,ThermostatState,01090d,180000000000, where desiredTemperature is 0 - ignore it
+    readingsBulkUpdate($shash, "desiredTemperature", sprintf("%2.1f",$desiredTemperature)) if($desiredTemperature != 0);
     readingsBulkUpdate($shash, "valveposition", $valveposition);
     if($measuredTemperature ne "") {
       readingsBulkUpdate($shash, "temperature", sprintf("%2.1f",$measuredTemperature));