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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! I suspect there may be a connection issue between the control and touch panel. See if the control will go into a service cycle, following instructions below.
SERVICE MODE This mode has 16 different options available for service diagnostics. To enter the mode hold the WARMER key and press the LIGHT button three times. The display will show “0.” When in this mode the WARMER and COLDER keys will act as up and down arrows to select the desired option. The LIGHT key is the ENTER key and will enter a function. If changing a setting, you must press the LIGHT key again to retain the changed setting. To exit the service mode scroll to option 99 and press the LIGHT key. After five minutes of not touching any keys the mode will also exit automatically.
Let me know what happens, please.