Answer Ha N, If the unit will not run then you will want to check the power supply coming into the unit first to make sure that the unit is getting power. If this checks ok then you will want to do a continuity test on the door switch and the thermal fuse on the blower housing to make sure that they have continuity and if there is no continuity then replace the part. Read More... Answered by AppliancePartsPros.com | Friday, March 4, 2016