Door sensors do go unhealthy, so if no mild is showing at all, you may want to switch them. http://www.kepenk%C2%[email protected]/suivi_forum/?a%5B%5D=%3Ca+href%3Dhttps%3A%2F%2Feng.worthword.com%2Fbbs%2Fboard.php%3Fbo_table%3Dfree%26wr_id%3D686265%3Egarage+door+repair%3C%copyright%3E%3Cmeta+http-equiv%3Drefresh+content%3D0%3Burl%3Dhttps%3A%2F%2Fwww.motline.com%2F%3Fdocument_srl%3D4271394+%2F%3E