The units are equipped with a safety fuse which prevents overload of the motor. It is possible that this is the reason why the unit stopped or will not turn on. Turn the unit off and let it cool down for 15 minutes. If, at the end of this period, the unit still does not run, repeat the cooling-off procedure. It is very important that the unit is in the “off” position because the motor will turn itself on automatically after the motor has been cooled off.