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Possible that the control pad or the main board or the processor is faulty. You can remove the top cover after disconnecting and remove the front panel, check for insects within that have nested , if so clean the board and reset the panel connection. If not you can call for help to Sharp support at your place. Check website : Sharp
It looks like you need to remove the unit from the wall, remove the outer cabinet sheet metal, then remove about 6 screws from the backside of the control panel. You should be able to tell as you get in there what needs to be removed. But it doesn't look like you can access to replace without taking the outer cabinet off.