GE Dishwasher Error Code F50

F50 means the control board has detected a high reading from the thermistor, which is the water temperature sensor. The board received a signal indicating the temperature was above the acceptable upper limit, causing the cycle to stop. This can be triggered by an actual sensor failure, a wiring short, or a loose connector, not necessarily by the water actually being too hot.

Running the dishwasher with an active F50 code is not advisable. The control board uses thermistor data to regulate water heating, and if that sensor circuit is compromised, the dishwasher may overheat water or run the heater incorrectly. Most units will halt the cycle automatically when F50 triggers, but continuing to force cycles risks damage to the heating element, pump, or dishes.

Disconnect power to the dishwasher, then locate and unplug the thermistor connector. Set a multimeter to measure resistance (ohms) and probe the two thermistor terminals. At room temperature, most GE dishwasher thermistors should read in the range of 10,000 to 50,000 ohms, but check your specific model's service sheet for the exact value. A reading near zero ohms indicates a short, which would cause a high-temperature signal and trigger F50. A reading of infinite resistance indicates an open circuit, which is a separate fault pattern.

Start by unplugging the dishwasher and locating the thermistor, typically found in the sump area near the pump. Inspect the wiring harness for damage and make sure the connector is fully seated. Use a multimeter to test the thermistor resistance at room temperature and compare it to the spec in your service manual. If the thermistor reads out of range, replace it. If the wiring and sensor both check out, the control board may need replacement.

If only the thermistor needs replacement, the part typically costs between $15 and $50 depending on the model, and it is a moderately accessible repair for a DIYer comfortable with basic disassembly. If the wiring harness is damaged, repair cost depends on severity, but harness replacements generally run $30 to $80 in parts. A control board replacement is more expensive, often $100 to $250 for the part alone, and professional labor will add $100 to $200 on top of that.