This error code indicates a problem in the heating element/heater relay. Unplug the dishwasher and pull it from the cabinet.
Remove the right-hand panel and check the relay. To test the relay, try to reach it from the bottom; it will be even more convenient if you put the dishwasher on the back.
It has been observed that heating elements and/or heater relays fail more frequently in homes where instant (tankless) water heaters are used. These water heaters do not require low GPM water flow rate. In turn, most dishwashers require an even lower GPM flow rate, so water fails to heat up during a fill. This causes the dishwasher’s heating element/heater relay to stay ON for too long and fail prematurely.