GE Dishwasher Error Code F16

F16 means the control board has detected a high water temperature condition based on the signal from the thermistor. This can be caused by a faulty thermistor sending a false reading, damaged wiring, a bad connector, or in rarer cases, the heating element genuinely overheating the water. Checking the thermistor and its harness first will identify the cause in most cases.

Running the dishwasher while F16 is active is not advisable. If the error reflects a real overtemperature condition rather than a bad sensor, continued operation could damage dish racks, plastic components, or the heating circuit. Most GE dishwashers will halt the cycle when F16 is triggered, which is the intended protective response. Resolve the fault before resuming normal use.

Yes, a failed thermistor is the most common reason for F16 appearing when the water is not actually overheating. Thermistors can drift out of their correct resistance range or develop an internal short that makes the control board read an artificially high temperature. Testing resistance with a multimeter at a known water temperature and comparing the reading to the spec chart in the service manual will confirm whether the sensor is faulty.

Start by unplugging the dishwasher and locating the thermistor in the sump or tub area. Inspect the wiring harness and connectors for corrosion or damage, disconnect and reseat the connector, then test the thermistor's resistance with a multimeter against the temperature curve in your model's service manual. If the thermistor is out of spec, replace it. If the harness is damaged, repair or replace the affected section. If the error persists after those steps, the control board may need evaluation by a technician.

If the fix is a loose or corroded connector, the cost is zero beyond your time. A replacement thermistor typically costs between $15 and $40 for the part. A wiring harness repair or replacement may run $20 to $60 in parts. If the control board is causing the heating element to overheat, board replacement can range from $100 to $250 or more depending on the model. Adding a service call from a technician generally adds $80 to $150 in labor.