In the troubleshooting guide says, if the voltages look good (10 V to 12 VDC) you should to move on to the the Control circuit board. My voltages looked correct so I moved on.

But the Temperature Control circuit board is in the front, in the door of the VinoTemp. The small temperatue display is part of the temperature control circuit board.

To continue troubleshooting, you open the front door and disassemble it from the inside. But that is not what fixed my VinoTemp.