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Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. First I’ll need some more info so I have a more complete picture of you situation.
Are you saying the unit (I assume a Lux thermostat) is programmed to 80 or that the thermostat is locked and you can't adjust the temp? On most models a small padlock is displayed if it's locked. I'll need the model number or a picture of the thermostat. You can post a picture here by clicking on ADD FILES next to the SEND button