diff --git a/fhem/FHEM/00_MAXLAN.pm b/fhem/FHEM/00_MAXLAN.pm
index a3f8dfbc3..f30cdf1a2 100755
--- a/fhem/FHEM/00_MAXLAN.pm
+++ b/fhem/FHEM/00_MAXLAN.pm
@@ -434,7 +434,7 @@ MAXLAN_Parse($$)
     Dispatch($hash, "MAX,define,$addr,$device_types{$devicetype},$serial,$groupid", {RAWMSG => $rmsg});
 
     if($len != length($bindata)) {
-      Log 1, "Invalid C: response, len does not match";
+      Dispatch($hash, "MAX,Error,$addr,Parts of configuration are missing", {RAWMSG => $rmsg});
       return "Invalid C: response, len does not match";
     }
 
diff --git a/fhem/FHEM/10_MAX.pm b/fhem/FHEM/10_MAX.pm
index 6895f3bcd..1a192a025 100755
--- a/fhem/FHEM/10_MAX.pm
+++ b/fhem/FHEM/10_MAX.pm
@@ -289,8 +289,8 @@ MAX_Parse($$)
     my $connected = $args[0];
 
     readingsSingleUpdate($shash,"connection",$connected,0);
-  } elsif($msgtype eq "HeatingThermostatConfig") {
 
+  } elsif($msgtype eq "HeatingThermostatConfig") {
     $shash->{ecoTemperature} = $args[0];
     $shash->{comfortTemperature} = $args[1];
     $shash->{boostValveposition} = $args[2];
@@ -300,6 +300,12 @@ MAX_Parse($$)
     $shash->{minimumTemperature} = $args[6];
     $shash->{windowOpenTemperature} = $args[7];
     $shash->{windowOpenDuration} = $args[8];
+
+  } elsif($msgtype eq "Error") {
+    $shash->{ERROR} = join(",",$args[0]);
+
+  } else {
+    Log 1, "MAX_Parse: Unknown message $msgtype";
   }
 
   #Build $shash->{STATE}