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Turn the ON/OFF switch to OFF and unplug the unit for 15 minutes. Then plug the uni back in and turn it ON. During that 15 minute timeout, the unit should have reset itself and reverted back to the original factory settings. If it did, you can set the controls as you desire.
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Simple test: the thermostat in your unit is electromechanical - unplug the unit from the mains, take it out and measure the resistance between the 2 electrical contacts, if it doesn't goes to near 0 when you turn it even a little bit then it's defective and it will have to be replaced.
If the resistance does indeed goes to near 0 then the defect is in the AC system. Another simple test: open the casing of the unit and put your hand directly on the compressor; now turn the thermostat button. If it doesn't vibrate then the starting capacitor of the compressor has failed and it will have to be replaced with a similar one.If it vibrates then the cooling circuit has got a leak and all the fluid has been lost. For that you will have to call a pro that will solder the leak shut and refill the circuit with the appropriate fluid - only he will have it, it's not sold on the customer market.
Turn the Master ON/OFF Switch to OFF and unplug the unit. Wait 15 minutes, plug the unit back in, Turn the Master ON/OFF Switch to ON. Hopefully, that 15 minute timeout allowed the electronics to reset and revert back to the original factory settings.
If you have to reset the plug then its pulling to many amps. If you don't know what else is connected to that particular line (in your breaker box) you might consider using another outlet. Increasing amps. of breaker may not be advisable without consulting an electrician.