Good thinking, Frigilux. I don't run my wash machine, dryer, or dishwasher when I'm not home, either. My washer rarely gets unbalanced, but if it does, it doesn't have an off-balance switch like the old Kenmores used to. It continues to jump up and down until I shut it off. That's all I need is a Mr. Mom episode in my upstairs utility room. Let's face it, laundry equipment and dishwashers are mechanical and sooner or later are going to develop problems that could be destructive if users aren't vigilant. I had a coworker who's dryer timer acted up and didn't shut off the dryer once the clothes were dry. Luckily she was home when the smoke alarms went off and she ran downstairs to find the dryer in flames. The fire department arrived and everything was okay, but it could've been disastrous if she wasn't there. So, yeah, appliance fires might occur because of carelessness but not always. Case in point, don't cook, wash or dry clothes, or run your dishwasher when you're not home to supervise.