This error code is for a high temperature heating error. Unplug the dishwasher or flip the circuit breaker that powers the dishwasher. Remove the dishwasher from under the counter. And remove the metal panel that is on the right side if you are looking at it from the front. It is 2 Phillips head screws. Using a flashlight, look at the very bottom of the pump housing and you will see the thermistor that you will need to replace. Unplug the connector from the thermistor then turn the thermistor 1/4 turn to the left and remove it. Installation is reverse from removal. Be sure to buy the replacement o-ring to use on the new thermistor. Any water that was released from the sump while the thermistor was removed will need to be cleared from the drain pain or you will get a leak error signified by the Heavy light flashing and the continuous running of the pump motor.