diff --git a/fhem/FHEM/00_OWX_ASYNC.pm b/fhem/FHEM/00_OWX_ASYNC.pm
index 6c41393ae..f32fe75b1 100644
--- a/fhem/FHEM/00_OWX_ASYNC.pm
+++ b/fhem/FHEM/00_OWX_ASYNC.pm
@@ -128,7 +128,7 @@ my %attrs = (
 );
 
 #-- some globals needed for the 1-Wire module
-$owx_async_version=5.1;
+$owx_async_version=5.2;
 #-- Debugging 0,1,2,3
 $owx_async_debug=0;
 
@@ -1136,6 +1136,9 @@ sub OWX_ASYNC_RunTasks($) {
         unless ($task->PT_SCHEDULE(@{$task->{ExecuteArgs}})) {
           shift @$queue;
           delete $master->{tasks}->{$owx_dev} unless @$queue;
+          if ($task->PT_RETVAL()) {
+            Log3 ($master->{NAME},2,"OWX_ASYNC: Error running task for $owx_dev: ".$task->PT_RETVAL());
+          }
         }
         OWX_ASYNC_Poll( $master );
       } else {
diff --git a/fhem/FHEM/10_FRM.pm b/fhem/FHEM/10_FRM.pm
index 4ad2bb570..400331266 100755
--- a/fhem/FHEM/10_FRM.pm
+++ b/fhem/FHEM/10_FRM.pm
@@ -42,6 +42,7 @@ my @clients = qw(
   FRM_ROTENC
   FRM_STEPPER
   OWX
+  OWX_ASYNC
   I2C_LCD
   I2C_DS1307
   I2C_PC.*
diff --git a/fhem/FHEM/21_OWAD.pm b/fhem/FHEM/21_OWAD.pm
index 5a4242a73..f77fc3847 100644
--- a/fhem/FHEM/21_OWAD.pm
+++ b/fhem/FHEM/21_OWAD.pm
@@ -90,7 +90,7 @@ use ProtoThreads;
 no warnings 'deprecated';
 sub Log($$);
 
-my $owx_version="5.13";
+my $owx_version="5.14";
 #-- fixed raw channel name, flexible channel name
 my @owg_fixed   = ("A","B","C","D");
 my @owg_channel = ("A","B","C","D");
@@ -1443,9 +1443,7 @@ sub OWXAD_GetPage($$$@) {
   return "$owx_dev has returned invalid data"
     if( length($res)!=22);
   #-- for processing we also need the 3 command bytes
-  OWXAD_BinValues($hash,$context,1,undef,$owx_dev,$select,10,substr($res,12,10));
-
-  return undef;
+  return OWXAD_BinValues($hash,$context,1,undef,$owx_dev,$select,10,substr($res,12,10));
 }
 
 ########################################################################################
diff --git a/fhem/FHEM/21_OWCOUNT.pm b/fhem/FHEM/21_OWCOUNT.pm
index d057c4bae..4ce42713f 100644
--- a/fhem/FHEM/21_OWCOUNT.pm
+++ b/fhem/FHEM/21_OWCOUNT.pm
@@ -99,7 +99,7 @@ no warnings 'deprecated';
 
 sub Log3($$$);
 
-my $owx_version="5.19";
+my $owx_version="5.21";
 #-- fixed raw channel name, flexible channel name
 my @owg_fixed   = ("A","B");
 my @owg_channel = ("A","B");
@@ -803,12 +803,9 @@ sub OWCOUNT_GetPage ($$$@) {
   my $interface= $hash->{IODev}->{TYPE};
   my $name    = $hash->{NAME};
   my $ret; 
-  my $oldfinal= $final;
   
   #-- check if memory usage has been disabled
   my $nomemory  = defined($attr{$name}{"nomemory"}) ? $attr{$name}{"nomemory"} : 0;
-  $final=0
-    if($nomemory==1);
   
   #-- even if memory usage has been disabled, we need to read the page because it contains the counter values
   if( ($nomemory==0) || ($nomemory==1 && (($page==14)||($page==15))) ){
@@ -1600,7 +1597,7 @@ sub OWXCOUNT_BinValues($$$$$$$$) {
       if( int(@data) < 42);
     #return "invalid data"
     #  if (ord($data[17])<=0); 
-    Log3 $name,1,"invalid CRC, ".ord($data[40])." ".ord($data[41])
+    return "invalid CRC, ".ord($data[40])." ".ord($data[41])
       if (OWX_CRC16($select.substr($res,0,40),$data[40],$data[41]) == 0);
       
     #-- first 3 command, next 32 are memory
@@ -1709,7 +1706,6 @@ sub OWXCOUNT_GetPage($$$) {
   return "$owx_dev has returned invalid data"
     if( length($res)!=54);
   return OWXCOUNT_BinValues($hash,$context,1,1,$owx_dev,$select,42,substr($res,12));
-  return undef;
 }
 
 ########################################################################################
diff --git a/fhem/FHEM/21_OWMULTI.pm b/fhem/FHEM/21_OWMULTI.pm
index 55ebefcb0..d88d3fd82 100644
--- a/fhem/FHEM/21_OWMULTI.pm
+++ b/fhem/FHEM/21_OWMULTI.pm
@@ -82,7 +82,7 @@ no warnings 'deprecated';
 
 sub Log($$);
 
-my $owx_version="5.14";
+my $owx_version="5.15";
 #-- flexible channel name
 my $owg_channel;
 
@@ -777,16 +777,13 @@ sub OWXMULTI_BinValues($$$$$$$$) {
   #-- process results
   my  @data=split(//,$res);
   if (@data != 9) {
-    Log 1, "invalid data length, ".int(@data)." instead of 9 bytes";
-    return;
+    return "invalid data length, ".int(@data)." instead of 9 bytes";
   }
   if ((ord($data[0]) & 112)!=0) {
-    Log 1, "conversion not complete or data invalid";
-    return;
+    return "conversion not complete or data invalid";
   }
   if (OWX_CRC8(substr($res,0,8),$data[8])==0) {
-    Log 1, "invalid CRC";
-    return;
+    return "invalid CRC";
   }
 
   #-- this must be different for the different device types
@@ -854,7 +851,7 @@ sub OWXMULTI_GetValues($) {
 
   my ($hash) = @_;
   
-  my ($i,$j,$k,$res,$res2);
+  my ($i,$j,$k,$res,$ret);
    
   #-- ID of the device
   my $owx_dev = $hash->{ROM_ID};
@@ -914,7 +911,8 @@ sub OWXMULTI_GetValues($) {
     if( $res eq 0 );
   return "$owx_dev has returned invalid data"
     if( length($res)!=20);
-  OWXMULTI_BinValues($hash,"ds2438.getvdd",1,undef,$owx_dev,undef,undef,substr($res,11));
+  $ret = OWXMULTI_BinValues($hash,"ds2438.getvdd",1,undef,$owx_dev,undef,undef,substr($res,11));
+  return $ret if (defined $ret);
   #------------------------------------------------------------------------------------
   #-- switch the device to current measurement off, V external only
   #-- issue the match ROM command \x55 and the write scratchpad command
@@ -957,8 +955,7 @@ sub OWXMULTI_GetValues($) {
     if( $res eq 0 );
   return "$owx_dev has returned invalid data"
     if( length($res)!=20);
-  OWXMULTI_BinValues($hash,$context,1,undef,$owx_dev,undef,undef,substr($res,11));
-  return undef;
+  return OWXMULTI_BinValues($hash,$context,1,undef,$owx_dev,undef,undef,substr($res,11));
 }
   
 #######################################################################################
@@ -1016,7 +1013,7 @@ sub OWXMULTI_PT_GetValues($) {
 
   my ($thread,$hash) = @_;
   
-  my ($i,$j,$k,$res,$res2,$response);
+  my ($i,$j,$k,$res,$ret,$response);
    
   #-- ID of the device
   my $owx_dev = $hash->{ROM_ID};
@@ -1106,7 +1103,10 @@ sub OWXMULTI_PT_GetValues($) {
   unless (defined $res and length($res)==9) {
     PT_EXIT("$owx_dev has returned invalid data");
   }
-  OWXMULTI_BinValues($hash,"ds2438.getvdd",1,undef,$owx_dev,undef,undef,$res);
+  $ret = OWXMULTI_BinValues($hash,"ds2438.getvdd",1,undef,$owx_dev,undef,undef,$res);
+  if (defined $ret) {
+    PT_EXIT($ret);
+  }
   #------------------------------------------------------------------------------------
   #-- switch the device to current measurement off, V external only
   #-- issue the match ROM command \x55 and the write scratchpad command
@@ -1173,7 +1173,10 @@ sub OWXMULTI_PT_GetValues($) {
   unless (defined $res and length($res)==9) {
     PT_EXIT("$owx_dev has returned invalid data");
   }
-  OWXMULTI_BinValues($hash,"ds2438.getvad",1,undef,$owx_dev,undef,undef,$res);
+  $ret = OWXMULTI_BinValues($hash,"ds2438.getvad",1,undef,$owx_dev,undef,undef,$res);
+  if (defined $ret) {
+    PT_EXIT($ret);
+  }
   PT_END;
 }
   
diff --git a/fhem/FHEM/21_OWSWITCH.pm b/fhem/FHEM/21_OWSWITCH.pm
index 3b711791f..f9409d911 100644
--- a/fhem/FHEM/21_OWSWITCH.pm
+++ b/fhem/FHEM/21_OWSWITCH.pm
@@ -89,7 +89,7 @@ no warnings 'deprecated';
 
 sub Log($$);
 
-my $owx_version="5.14";
+my $owx_version="5.15";
 #-- fixed raw channel name, flexible channel name
 my @owg_fixed   = ("A","B","C","D","E","F","G","H");
 my @owg_channel = ("A","B","C","D","E","F","G","H");
@@ -1035,7 +1035,7 @@ sub OWXSWITCH_BinValues($$$$$$$$) {
       if( int(@data) != 2){
         return "state could not be set for device $owx_dev";
       }
-      Log 1,"invalid CRC"
+      return "invalid CRC"
         if (OWX_CRC16($command,$data[0],$data[1]) == 0);
       #-- put into local buffer
       $hash->{owg_val}->[0] = $value % 2;
@@ -1082,7 +1082,7 @@ sub OWXSWITCH_BinValues($$$$$$$$) {
 sub OWXSWITCH_GetState($@) {
   my ($hash,$sync) = @_;
   
-  my ($select, $res, $res2, $res3, @data);
+  my ($select, $res, @data);
   
   #-- ID of the device
   my $owx_dev = $hash->{ROM_ID};
@@ -1111,7 +1111,7 @@ sub OWXSWITCH_GetState($@) {
     return "$owx_dev has returned invalid data"
       if( length($res)!=16);
     OWX_Reset($master);
-    OWXSWITCH_BinValues($hash,"ds2406.getstate",1,undef,$owx_dev,substr($res,9,3),undef,substr($res,12));
+    return OWXSWITCH_BinValues($hash,"ds2406.getstate",1,undef,$owx_dev,substr($res,9,3),undef,substr($res,12));
   #-- family = 29 => DS2408
   }elsif( $hash->{OW_FAMILY} eq "29" ) {
     #=============== get gpio values ===============================
@@ -1193,7 +1193,7 @@ sub OWXSWITCH_SetState($$) {
     #-- issue the match ROM command \x55 and the write status command
     #   \x55 at address TA1 = \x07 TA2 = \x00
     #-- reading 9 + 4 + 2 data bytes = 15 bytes
-    my $select=sprintf("\x55\x07\x00%c",$statneu);   
+    $select=sprintf("\x55\x07\x00%c",$statneu);
     OWX_Reset($master);
     $res=OWX_Complex($master,$owx_dev,$select,2);
     if( $res eq 0 ){
@@ -1243,7 +1243,7 @@ sub OWXSWITCH_SetState($$) {
 sub OWXSWITCH_PT_GetState($) {
   my ($thread,$hash) = @_;
   
-  my ($select, $res, $res2, $res3, @data, $response);
+  my ($select, $ret, @data, $response);
   
   #-- ID of the device
   my $owx_dev = $hash->{ROM_ID};
@@ -1276,7 +1276,10 @@ sub OWXSWITCH_PT_GetState($) {
     unless (length($response->{readdata}) == 4) { 
       PT_EXIT("$owx_dev has returned invalid data");
     }
-    OWXSWITCH_BinValues($hash,"ds2406.getstate",1,1,$owx_dev,$response->{writedata},4,$response->{readdata});
+    $ret = OWXSWITCH_BinValues($hash,"ds2406.getstate",1,1,$owx_dev,$response->{writedata},4,$response->{readdata});
+    if (defined $ret) {
+      PT_EXIT($ret);
+    }
   #-- family = 29 => DS2408
   }elsif( $hash->{OW_FAMILY} eq "29" ) {
     #=============== get gpio values ===============================
@@ -1295,7 +1298,10 @@ sub OWXSWITCH_PT_GetState($) {
     unless (length($response->{readdata}) == 10) {
       PT_EXIT("$owx_dev has returned invalid data")
     };
-    OWXSWITCH_BinValues($hash,"ds2408.getstate",1,1,$owx_dev,$response->{writedata},10,$response->{readdata});
+    $ret = OWXSWITCH_BinValues($hash,"ds2408.getstate",1,1,$owx_dev,$response->{writedata},10,$response->{readdata});
+    if (defined $ret) {
+      PT_EXIT($ret);
+    }
   #-- family = 3A => DS2413
   }elsif( $hash->{OW_FAMILY} eq "3A" ) {
     #=============== get gpio values ===============================
@@ -1314,7 +1320,10 @@ sub OWXSWITCH_PT_GetState($) {
     unless (length($response->{readdata}) == 2) {
       PT_EXIT("$owx_dev has returned invalid data");
     }
-    OWXSWITCH_BinValues($hash,"ds2413.getstate",1,1,$owx_dev,$response->{writedata},2,$response->{readdata});
+    $ret = OWXSWITCH_BinValues($hash,"ds2413.getstate",1,1,$owx_dev,$response->{writedata},2,$response->{readdata});
+    if (defined $ret) {
+      PT_EXIT($ret);
+    }
   } else {
     PT_EXIT("unknown device family $hash->{OW_FAMILY}\n");
   }
@@ -1386,8 +1395,9 @@ sub OWXSWITCH_PT_SetState($$) {
     if( int(@data) != 2){
       PT_EXIT("state could not be set for device $owx_dev");
     }
-    Log 1,"invalid CRC"
-      if (OWX_CRC16($command,$data[0],$data[1]) == 0);
+    if (OWX_CRC16($command,$data[0],$data[1]) == 0) {
+      PT_EXIT("invalid CRC");
+    }
       
     #-- put into local buffer
     $hash->{owg_val}->[0] = $value % 2;
diff --git a/fhem/FHEM/21_OWTHERM.pm b/fhem/FHEM/21_OWTHERM.pm
index 927ea58b2..7a20bb113 100755
--- a/fhem/FHEM/21_OWTHERM.pm
+++ b/fhem/FHEM/21_OWTHERM.pm
@@ -86,7 +86,7 @@ no warnings 'deprecated';
 sub Log3($$$);
 sub AttrVal($$$);
 
-my $owx_version="5.16";
+my $owx_version="5.18";
 
 my %gets = (
   "id"          => "",
@@ -504,7 +504,7 @@ sub OWTHERM_GetValues($@) {
   
   my $name    = $hash->{NAME};
   my $value   = "";
-  my $ret     = "";
+  my $ret;
   
   #-- check if device needs to be initialized
   if( $hash->{READINGS}{"state"}{VAL} eq "defined"){
@@ -1008,7 +1008,6 @@ sub OWXTHERM_GetValues($) {
   return "$owx_dev has returned invalid data"
     if( length($res)!=19);
   return OWXTHERM_BinValues($hash,"ds182x.reading",1,undef,$owx_dev,undef,undef,substr($res,10,9));
-  return undef;
 } 
 
 #######################################################################################