First, you can check the electrical outlet to make sure that it’s working. I would check it by using other home appliances ( a small one like a hairdryer or a drill). Second, you can check the reset button on the unit's upper left to see if it has popped out. If it has, that is where the problem is, just push it back to where it’s supposed to be. After reviewing all of these and your unit power still does not come on, it’s time to call the local dealer for maintenance service.