Haier Air conditioner problems - e1 message

My air conditioner was running just fine. I got a little cold so I decided to turn it down. None of the buttons would work, including the power button. So, the only way I could turn it off was to unplug it. This I did do, but when I went to plug it back in all it did was give me a "e1" message where the temperature reading is. What is going on???? I am going to literally burn the hell up in this heat. What happened here? And how do I fix this?

Thanks