diff --git a/fhem/FHEM/60_EM.pm b/fhem/FHEM/60_EM.pm
index fdaa3c87c..c41ece08d 100755
--- a/fhem/FHEM/60_EM.pm
+++ b/fhem/FHEM/60_EM.pm
@@ -53,7 +53,7 @@ EM_Define($$)
 
   Log 3, "EM opening device $dev";
   my $po = new Device::SerialPort ($dev);
-  return "Can't open $dev: $!\n" if(!$po);
+  return "Can't open $dev: $!" if(!$po);
   Log 3, "EM opened device $dev";
   $po->close();
 
@@ -229,7 +229,10 @@ EmGetData($$)
   $d = EmMakeMsg(pack('H*', $d));
 
   my $serport = new Device::SerialPort ($dev);
-  die "Can't open $dev: $!\n" if(!$serport);
+  if(!$serport) {
+    Log 1, "EM: Can't open $dev: $!";
+    return undef;
+  }
   $serport->reset_error();
   $serport->baudrate(38400);
   $serport->databits(8);
@@ -282,6 +285,7 @@ EmGetData($$)
         if(b($retval,1) != 0)         { $rm = "EM Bad second byte"; goto DONE; }
         if(w($retval,2) != $l-7)      { $rm = "EM Length mismatch"; goto DONE; }
         if(!EmCrcCheck($retval,$l-7)) { $rm = "EM Bad CRC";         goto DONE; }
+        $serport->close();
         return substr($retval, 4, $l-7);
       }
     }
diff --git a/fhem/FHEM/61_EMWZ.pm b/fhem/FHEM/61_EMWZ.pm
index b069d5929..a20781d4a 100755
--- a/fhem/FHEM/61_EMWZ.pm
+++ b/fhem/FHEM/61_EMWZ.pm
@@ -61,7 +61,7 @@ EMWZ_GetStatus($)
   my $cur_energy = $pulses / $ec;       # ec = U/kWh
   my $cur_power = $cur_energy / 5 * 60; # 5minute interval scaled to 1h
 
-  if($cur_power > 100) {
+  if($cur_power > 30) { # 20Amp x 3 Phase
     my $msg = "EMWZ Bogus reading: curr. power is reported to be $cur_power";
     Log GetLogLevel($name,2), $msg;
     return $msg;
diff --git a/fhem/FHEM/62_EMEM.pm b/fhem/FHEM/62_EMEM.pm
index 82714a548..5e2cf2bb6 100755
--- a/fhem/FHEM/62_EMEM.pm
+++ b/fhem/FHEM/62_EMEM.pm
@@ -52,7 +52,7 @@ EMEM_GetStatus($)
   my $iec = 1000;
   my $cur_power = $pulses / 100;
 
-  if($cur_power > 100) {
+  if($cur_power > 30) { # 20Amp x 3 Phase
     my $msg = "EMEM Bogus reading: curr. power is reported to be $cur_power";
     Log GetLogLevel($name,2), $msg;
     return $msg;