Technically, the E4 error is not an error at all. It actually tells you, your unit is going into defrost mode. That does, however, mean that something has caused your unit to get too cold. A broken temperature sensor can also cause your AC to enter defrost mode.

How Much Electricity Does an Air Conditioner Use? Air conditioner usage varies based on the size of your AC. However, generally speaking, a central air conditioner will consume between 3000 and 3500 watts per hour. While window units use between 900 and 1440 watts per hour, portable units consume between 2900 and 4100.

Unplug and plug it back in after 30 seconds for the product resetting. Your air conditioner may not turn on because of a faulty power cord interrupting the power supply. Test the outlet you are using with a different appliance and see if it receives power.