Adding Houzz icon into theme

Hi, So have have seen the page you are going to link to me and have already got that far. But I think my code might be messed up somewhere. I have added this to the theme functions.php file

add_filter('avf_default_icons','avia_add_custom_icon', 10, 1);
function avia_add_custom_icon($icons)
{
$icons['houzz']	 = array( 'font' =>'fontello', 'icon' => 'ue800');
// Add new icon here
return $icons;
}

add_filter('avf_social_icons_options','avia_add_custom_social_icon', 10, 1);
function avia_add_custom_social_icon($icons)
{
$icons['Houzz'] = 'houzz';
// Add new icon here
return $icons;
};

Everything seems to be working well EXCEPT the icon is not show up on the front end. Any Idea where I went wrong?

Here is a link to the site and you can see the icons at the bottom and the last one just has a hover.

Thanks