Gerald S Stronghurst , IL June 16, 2015 Appliance: Model MEDB400VQO Dryer wouldnt start after big storm had fault code of co which isnt in the tech sheet Checked incoming power checked both thermal fuses checked belt and door switch all ok there are 2 circuit boards the first board still threw a co code sent that board back and got the user interface electronic control board and it took right off 5 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours