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Hi, this is usually a bad touchpad. The way to tell for sure is to kill power to the unit, take the control panel down and unplug the ribbon connector that connects touchpanel to the clock. Put it back together and reapply power. The clock will just sit there blinking and, obviously, the buttons won't work, either. if the beeping stops, then the touch panel is bad. And If it still beeps, then you have a bad clock.
I took the touch pad control unit apart, clean the connector for the ribbon wire connection between the key pad and the control unit, reseated the ribbon wire in the connection. Everything worked like new.