[Tangman]

Check the air filter behind the front air intake, it usually needs to be cleaned every 2 months or so...but if you have tried a lower setting and it didn't shut off , it could be the thermostat ( it is the cheapest part of the unit) or an over heating condition, how long did you have it unplugged? if it was over heating ( from the air filter being plugged)unplugging and just replugging it back in ,would not give it enough time to cool down