Can I keep using my GE appliance with this error showing?

Usually not. GE appliances show this error when a part or safety circuit is out of range, so running it can stop the cycle or make the problem worse. Diagnose and clear the error before normal use.

What part is most commonly replaced for GE Dishwasher Thermistor / Temperature Sensor Replacement?

The parts that most often fix GE Dishwasher Thermistor / Temperature Sensor Replacement are listed in the parts section of this guide. Match the part to your exact model and serial number before you buy.

Is GE Dishwasher Thermistor / Temperature Sensor Replacement a DIY repair or do I need a technician?

Many fixes are DIY-friendly with basic tools, such as door switches, drain pumps, water inlet valves, thermostats, heating elements, and filters. Sealed-system, refrigerant, gas, or high-voltage work should go to a licensed technician for safety.

GE Dishwasher Thermistor / Temperature Sensor Replacement

Q: What does GE Dishwasher Thermistor / Temperature Sensor Replacement mean?

Dishwasher won't heat, flashes flood/sensor codes, or runs cold cycles. Replacing the turbidity/temperature sensor assembly fixes it.

Q: How do I fix GE Dishwasher Thermistor / Temperature Sensor Replacement?

Work through the step-by-step fix below. Start with the quick reset and the most common cause, then check the specific part this guide points to. Most fixes need only basic hand tools and the right replacement part.

GE Dishwasher Thermistor / Temperature Sensor Replacement — What This Part Does

The turbidity and temperature sensor assembly sits in the sump at the bottom of the dishwasher and monitors water temperature so the control board knows when the water is hot enough for effective washing. On many GE models it also measures turbidity (how dirty the water is) to adjust cycle time. The sensor uses a thermistor element that changes electrical resistance with temperature, and the board reads that resistance to calculate water temp.

The sensor fails when the thermistor element inside breaks or drifts out of spec, giving the board bad readings or an open circuit. Corrosion at the connector, a damaged wiring harness, or a loose sensor not fully seated in the sump can also cause the same fault codes. Some GE models use a flood-switch and thermistor assembly that serves double duty for leak detection and temperature sensing, and the whole assembly is the service part on those machines.

Jump to Replacement Steps

Signs It Needs Replacing

Dishwasher runs cold or won’t heat Water stays cold through the entire wash because the board can’t read temperature and won’t turn on the heating element.
Error code pointing to temperature or flood sensor Control flashes a fault code (code varies by model) indicating the thermistor circuit is open, out of range, or the flood switch assembly has failed.
Cycles take much longer than normal The dishwasher extends cycle time or loops because it’s waiting for a temperature target it can’t measure or confirm.
Dishes come out greasy or dirty Without hot water the detergent doesn’t activate properly and soil stays on the dishes.
Machine shuts off mid-cycle with no explanation The board interprets the bad sensor reading as a flood condition or unsafe temperature and stops the cycle for safety.
Sensor reads open circuit or wrong resistance Measuring the sensor terminals with a multimeter shows infinite resistance (open) or a value far from the spec on the tech sheet for your model.

How to Replace It

Unplug the dishwasher or turn off the circuit breaker, then turn off the water supply valve under the sink.
Remove the lower access panel (toe-kick) at the front base of the dishwasher and pull back any insulation to expose the sump area.
Place a towel under the sump because residual water will spill when you remove the sensor.
Locate the turbidity/temperature sensor assembly on the side or bottom of the sump (a round disc or cylindrical part with a wiring harness), then disconnect the wire connector and inspect it for corrosion or loose pins.
Twist the sensor counterclockwise (or pull straight out on some models) to unlock and remove it from the sump, noting the orientation of any index mark on top.
Measure the resistance across the sensor terminals with a multimeter and compare to the ohms chart on your model’s tech sheet (common spec is around 10,000–10,450 ohms at 75°F, but this varies by model).
Install the new sensor by aligning any index mark or tab to face the front of the dishwasher, pressing it into the sump, and rotating clockwise until it locks into place.
Reconnect the wire harness, tuck the insulation back in, and reinstall the lower access panel.
Restore power and water, then run a test cycle to confirm the dishwasher heats normally and completes without error codes.

The Part You Need

Part	Notes
GE dishwasher turbidity and temperature sensor assembly	Amazon \| Part number varies by model (example WD21X29818). Check your model and serial number plate inside the door frame and cross-reference with GE parts diagrams or the tech sheet under the door to find the correct sensor for your machine.

If this part is failing you may also see one of these codes:

When to Call a Pro

If you’ve replaced the sensor and checked the connector but the fault code persists, the problem may be in the wiring harness between the sensor and the control board, or the board input itself has failed. Tracing harness continuity and testing board circuits requires a schematic and multimeter work that most homeowners don’t want to tackle. Also, if your model uses a combined flood-switch and thermistor assembly and you’re not comfortable working around the leak-detection plumbing in the base, a tech can swap it quickly and verify the flood circuit is safe before you run the machine again.