use the_posts_pagination(); without title

There is "screen_reader_text" property that should help you

the_posts_pagination( array(    'screen_reader_text' => ' ',     'prev_text'          => __( 'Previous', 'twentyfifteen' ),    'next_text'          => __( 'Next', 'twentyfifteen' ),    'before_page_number' => '<span class="meta-nav screen-reader-text">' . __( '', 'nieuwedruk' ) . ' </span>',) );

Note: Hence the space between the single quotes.

While searching for a solution i've found this link to be the most relative but not a complete solution for my situation. Above answer will cause a warning when validating your HTML with W3C.

I've found a way to completely remove the heading by adding an action which will remove the h2 tag with preg_replace(). Regex isn't my best job so if you have suggestions please let me now.

I've put the following action in my functions.php:

function sanitize_pagination($content) {    // Remove role attribute    $content = str_replace('role="navigation"', '', $content);    // Remove h2 tag    $content = preg_replace('#<h2.*?>(.*?)<\/h2>#si', '', $content);    return $content;}add_action('navigation_markup_template', 'sanitize_pagination');

Above function will also remove the "role" attribute from the nav element (Causes W3C warning).

I know this is an old post, but for people wanting simple solution,a simple CSS block would do the trick. No need to tweak php.

h2.screen-reader-text {    display: none;}

or

.post-navigation h2.screen-reader-text {    display: none;}