We regret the trouble you have experienced with this microwave oven. According to our information, it does not appear that the interior fan should activate when the door is open. It is not uncommon for the vent fan to activate when the cooking surface is hot. However, if this is not the case, then the unit may require service. To make service arrangements, you may either contact our Customer Interactive Center at 800-243-0000, or you can check our Repair Provider Lookup on our website, at http://www.lg.com/us/support/repair/support-repair-provider-lookup.jsp.
Date published: 2019-08-15