diff --git a/fhem/FHEM/01_FHEMWEB.pm b/fhem/FHEM/01_FHEMWEB.pm
index 1a0dee052..c6bb642c1 100755
--- a/fhem/FHEM/01_FHEMWEB.pm
+++ b/fhem/FHEM/01_FHEMWEB.pm
@@ -2149,7 +2149,7 @@ FW_sliderFn($$$$$)
   my $cv = ReadingsVal($d, $cmd, Value($d));
   my $id = ($cmd eq "state") ? "" : "-$cmd";
   $cmd = "" if($cmd eq "state");
-  $cv =~ s/.*?(\d+).*/$1/; # get first number
+  $cv =~ s/.*?([.\-\d]+).*/$1/; # get first number
   $cv = 0 if($cv !~ m/\d/);
   return "<td colspan='2'>".
            "<div class='slider' id='slider.$d$id' min='$min' stp='$stp' ".
diff --git a/fhem/www/pgm2/fhemweb_slider.js b/fhem/www/pgm2/fhemweb_slider.js
index 52e0684b0..9f4108fa0 100644
--- a/fhem/www/pgm2/fhemweb_slider.js
+++ b/fhem/www/pgm2/fhemweb_slider.js
@@ -7,7 +7,6 @@ FW_sliderUpdateLine(d)
     if(k == 1)
       name = name+"-"+d[1].replace(/[ \d].*$/,'');
     el = document.getElementById(name);
-
     if(el) {
       var doSet = 1;    // Only set the "state" slider in the detail view
       if(el.parentNode.getAttribute("name") == "val.set"+d[0]) {
@@ -18,8 +17,8 @@ FW_sliderUpdateLine(d)
       }
 
       if(doSet) {
-        var val = d[1].replace(/^.*?(\d+).*/g, "$1"); // get first number
-        if(!val.match(/\d+/))
+        var val = d[1].replace(/^.*?([.\-\d]+).*/g, "$1"); // get first number
+        if(!val.match(/[.\-\d]+/))
           val = 0;
         FW_sliderCreate(el, val);
       }
@@ -133,7 +132,7 @@ FW_sliderSelChange(name, devName, vArr)
 function
 FW_querySetSlider(el, val)
 {
-  val = val.replace(/[^\d\.]/g, ""); // remove non numbers
+  val = val.replace(/[^\d.\-]/g, ""); // remove non numbers
   FW_sliderCreate(el, val);
 }