Air Conditioner: Panel Malfunction
Generally if a board starts acting "squirrely" like that, it's bad and they are not repairable. But in many cases it's not that hard to replace the entire board. Get the model number of your unit and do an internet search for a "main board" for it. If your unit is popular, you may find it for sale and in fact you may find a YouTube video showing you how to replace it. I have done that recently for two different electronic based appliances, both repairs were simple and inexpensive (compared to replacing the entire appliance).