Answer Kirk, this error is going to indicate a communication failure from the central control W10427972 to the user control W10604648 (unfortunately, the user control has been discontinued and is no longer available). The wires running from the central control to the user control would need to be checked for any loose connection and damaged sections. If the user interface is responsive, a voltage test would need to be done at the central control connection U17 while the unit is turned on. From pin 3 (black meter probe) to pin 2 (red meter probe), there should be a 12VDC supply. If voltage is present, replace the user control. Read More... Answered by AppliancePartsPros.com | Wednesday, April 7, 2021