Kenmore Dishwasher Error Code 3-2

Code 3-2 means the control board detected a problem in the temperature sensing circuit. This can be caused by incoming water that is too hot (above 167°F), a shorted temperature sensor, damaged wiring in the sensor circuit, or a faulty sensor input on the control board. The dishwasher stops the cycle because it cannot confirm a safe and accurate water temperature reading.

You should not continue running the dishwasher with this code active. The 3-2 code means the machine cannot reliably monitor water temperature, which affects both wash performance and the heating element's safe operation. Running cycles without accurate temperature feedback could result in improper sanitizing or, in some fault scenarios, overheating. Address the root cause before resuming normal use.

Disconnect power to the dishwasher before testing. Locate the thermistor, usually mounted in the sump at the tub base, and disconnect its wiring connector. Set a multimeter to measure resistance (ohms) and probe the sensor terminals. At room temperature, most dishwasher thermistors read in the range of 10,000 to 50,000 ohms depending on the model; consult your tech sheet for the exact specification. A reading of near zero (shorted) or infinite resistance (open) confirms a faulty sensor. You can also run the dishwasher's service diagnostics cycle, which actively tests the temperature sensor and helps isolate whether the sensor, wiring, or control is at fault.

Start by checking the temperature of your incoming hot water at the kitchen faucet using a thermometer. If it exceeds 167°F, lower your water heater setting and retest. If water temperature is normal, run the service diagnostics cycle to test the temperature sensor's operation. Then use a multimeter to check the resistance of the thermistor and inspect the wiring harness for shorts or damaged connectors. If the sensor reads out of spec, replacing it is typically the fix. If all components check out, the control board may need replacement.

If the fix is simply lowering your water heater temperature, there is no parts cost. A replacement thermistor (temperature sensor) typically costs between $10 and $40 for the part, making it one of the more affordable repairs. If the control board is at fault, the board itself can run $100 to $250 or more depending on the model. Professional labor generally adds $100 to $200 on top of parts, so a sensor replacement done professionally usually stays under $250 total.