FacetWP – conditionally display facet labels

Your code seems identical to FacetWP’s. The only variable I can think of is code placement. You might not be placing the code where it belongs (functions.php or a plugin). A quick fix would be adding their code to your theme’s functions.php:

   function fwp_add_facet_labels() {
    ?>
   <script>
   (function($) {
    $(document).on('facetwp-loaded', function() {
    $('.facetwp-facet').each(function() {
        var facet_name = $(this).attr('data-name');
        var facet_label = FWP.settings.labels[facet_name];
        if ($('.facet-label[data-for="' + facet_name + '"]').length < 1) {
            $(this).before('<h3 class="facet-label" data-for="' + facet_name + '">' + facet_label + '</h3>');
        }
       });
     });
   })(jQuery);
   </script>
   <?php
   }
   add_action( 'wp_head', 'fwp_add_facet_labels', 100 );

Or alternatively follow their instructions: Here