How to Replace a GE Dishwasher Temperature Sensor
When a GE dishwasher runs marathon cycles, will not heat, or throws a C3 code, the thermistor is the usual cause. Replacing it is a 20-30 minute intermediate job, and GE Profile and Cafe models add a separate turbidity sensor that is often just dirty rather than failed.
The thermistor is a resistance sensor whose value changes with temperature, and the board uses it to run the heater and confirm sanitize. A reading it cannot trust extends the cycle for hours or blocks heating. The turbidity sensor is a separate optical device that reads water clarity for AutoSense, and a grease film on its window is the most common cause of AutoSense misbehavior.
Before you start#
| Category | What you need |
|---|---|
| Tools | Phillips #2 screwdriver, 1/4-inch hex driver, multimeter, flashlight |
| Parts | Thermistor for your model (check the tech sheet) |
| Time and level | 20-30 minutes, Intermediate |
Safety warning: Turn off the circuit breaker. The sensor itself is low-voltage but is accessed near the 120V heater and pump connections.
Do You Have the Right Tools?
Water pressure gauge ($60), spray arm tester, float switch multimeter ($85), and drain inspection camera. Our technician arrives with $3,000+ in professional tools — your diagnostic is free.
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Step-by-step#
1 - Confirm the sensor failed. With the breaker off, drop the kick plate, find the sensor wires on the sump, and unplug the connector. On ohms, most GE thermistors read 10K-50K at a 70F room temperature; an infinite or near-zero reading means it is bad. To be sure, warm the tip and watch the resistance drop as temperature rises.
2 - Locate the sensor. GE mounts the thermistor either in the sump wall, reached from below the kick plate, or inside the tub near the filter, seen as a small probe in the sump floor. The turbidity sensor, on Profile and Cafe models, sits inside the tub by the filter housing and looks like a small optical window.
3 - Access from the right side. For a sump-mounted sensor, work from below behind the kick plate. For a tub-mounted one, pull the lower rack, spray arm, and filter to reach the probe.
4 - Remove the old sensor. Unplug the connector, noting its harness position, then release the clip, screw, or press-fit grommet holding the probe and draw it out.
5 - Fit the new sensor. Insert the new probe into the same opening with any grommet seated to prevent leaks, and make sure the sensing tip reaches into the sump where water collects. Secure it snugly without over-tightening, which cracks the plastic body, then route and reconnect the wire.
6 - Test and reassemble. Rebuild the filter, spray arm, and rack or refit the kick plate, restore power, and run a Normal cycle. Confirm it finishes in a normal 60-90 minutes with no code and hot water mid-cycle. If C3 persists, recheck the connector seating, then suspect the heater element or board.
Turbidity sensor: clean before you replace#
The turbidity sensor's window fogs with grease over time and reads the water as cleaner than it is, shortening AutoSense cycles. Before swapping it, disconnect its wire, pull it from the housing, and wipe the optical window with a soft cloth and warm soapy water. If cleaning does not restore normal behavior, fit the new sensor in the same spot and reconnect.
Safety First — Know the Risks
Live 120V wiring in a wet environment is one of the most dangerous DIY scenarios. Water + electricity = serious shock risk. Our techs are licensed and insured — let them handle the risk.
Licensed & Insured · 90-Day Warranty · Same-Day Service
When to call a professional#
EasyBear technicians serving Sacramento and the Bay Area carry GE-specific diagnostic tools and replacement parts on every service call.
- The sensor reads normal but the dishwasher still will not heat, pointing at the board or heater.
- You cannot find the sensor on your model after checking the tech sheet.
- The sensor mounting area is corroded or leaking.
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