functions.php

/**
 * Ensure that FacetWP detects custom post-type query loops:
 * NOTE: the query vars must have a custom 'facetwp' parameter, like this:
 	$args = array(
	    'post_type' => 'event',
	    'posts_per_page' => 10,
	    'facetwp' => true, // we added this
	);
	$query = new WP_Query( $args );
 */
function wuwo_facetwp_is_main_query( $is_main_query, $query ) 
{
    if ( isset( $query->query_vars['facetwp'] ) ) {
        $is_main_query = true;
    }

    return $is_main_query;
}

if( function_exists('facetwp_display') )
{
	add_filter( 'facetwp_is_main_query', 'wuwo_facetwp_is_main_query', 10, 2 );
}