Used 2x and it stopped heating up. No help in the instructions, but when I opened it I found a thermal reset switch. Pushed the button and back up and running. This reset should be accessible from the outside of the unit so it is not necessary to remove all the screws and open it for a simple reset. This should also be in the instructions and would save hours of troubleshooting and banging my head against a wall for a unit that is 10 days past return window.