GE Dishwasher Error Code F66

F66 means the control board detected a fault in the dry heater circuit. The dry heater is the component that generates heat specifically for the drying cycle. The board found a problem with electrical continuity or resistance in that circuit, which could be caused by a bad wiring harness connection or a burned-out heater element.

The dishwasher may still wash dishes, but the heated drying function will not work properly, and the cycle may stop short of completion. Running it repeatedly with an active F66 code is not likely to cause further damage, but your dishes will come out wet. Addressing the fault is recommended before continued regular use, especially since some units may lock out the cycle entirely depending on the model.

Inspecting and reseating the wiring harness is well within DIY range and requires only a screwdriver to remove the inner door panel. Testing the dry heater with a multimeter and replacing the element is also manageable for someone comfortable with basic appliance repair. Control board replacement is more involved but still doable with the correct part and model number. If you are unsure about working with electrical components or the fault returns after replacing the heater, a qualified appliance technician can complete a full diagnosis.

Start by unplugging the dishwasher and locating the wiring harness that runs to the dry heater, usually accessible by removing the inner door panel. Check for any burned, pinched, or disconnected wires and reseat all connectors. If the harness looks fine, test the dry heater element with a multimeter for continuity. A reading of infinite resistance means the element has failed and needs to be replaced. If both the harness and element test good, the control board may need replacement.

If only the wiring harness connector needs reseating or cleaning, the repair costs nothing beyond your time. A replacement dry heater element typically runs between $30 and $80 for the part depending on the model. If a technician is needed for diagnosis and replacement, expect $100 to $200 in labor on top of the part cost. A control board replacement is the most expensive scenario, with parts ranging from $100 to $250 plus labor.