Shawn H St. George , UT January 18, 2015 Appliance: Model 721.79152010 Kenmore elite microwave running with door open (not cooking) Our oven wouldn't cook but the fan and light would come on with the door open. After reading many forum posts on the internet I determined that either 1 or more of the interlock switches had failed. I couldn't tell from testing them so I ordered all three switches from Appliance Pros. The switches were about $15 with shipping and all right to my door and arrived in 3 days. I was able to install them and now the oven works as it should. I was unable to tell which switch(es) were bad from testing them with an ohm meter. They all had continuity when they should have and none when they shouldn't. I just threw them away. The oven has been fixed now for several days and we haven't had any more problems with it. It is nice to have a venue like Appliance Pros to look all this up and be able to find a solution. This oven wasn't cheap and it's only about 2 years old. It should last many years. Thanks 32 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes