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Error code reference

Jenn-Air Dishwasher Error Code 3-2

Shorted thermistor/OWI temperature sensing circuit

Jenn-Air codesJenn-Air dishwasher codes

Shorted thermistor/OWI temperature sensing circuit — incoming water temperature above 75°C (167°F), shorted connection or component, shorted or faulty temperature sensor, or faulty temperature sensor input on control.

First step from the service manual

1. Check incoming water temperature. 2. Check operation of temperature sensor in Service Diagnostic cycle. 3. Unplug dishwasher or disconnect power. 4. Check all components and connections in the Temperature Sensing Circuit with meter. Fix/replace shorted wires/part.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What 3-2 means on a Jenn-Air dishwasher

The Jenn-Air dishwasher error code 3-2 indicates the control board has detected a shorted condition in the thermistor/OWI (Optical Water Indicator) temperature sensing circuit. Specifically, the control is reading a temperature above 75°C (167°F) on the incoming water temperature input, which can be caused by a shorted thermistor, a short in the wiring harness connecting the temperature sensor, or a failed temperature sensor input on the control board itself. The diagnostic approach involves verifying incoming water temperature first, then testing the sensor through the Service Diagnostic cycle, and finally using a meter to check resistance and continuity across all components in the temperature sensing circuit.

For homeowners, this error means your dishwasher's control board is receiving an abnormal signal from the temperature sensor that monitors water heat. The sensor or its wiring is either physically shorted together or the incoming water supply is genuinely too hot, which can occur if a water heater is set unusually high. The dishwasher stops normal operation to prevent potential damage from overheating. In most cases the fix involves replacing the thermistor or repairing a shorted wire, both of which are manageable repairs if you are comfortable working with appliance wiring and a multimeter.

Source: manufacturer service documentation.

Common causes of 3-2

  1. 01

    Shorted or faulty thermistor (temperature sensor)

    Part replacement

    The thermistor itself can fail internally, creating a short circuit that sends an out-of-range signal to the control board. When shorted, the sensor reports an artificially high temperature, triggering the 3-2 code.

  2. 02

    Shorted or damaged wiring in the temperature sensing circuit

    Part replacement

    Wires in the harness connecting the thermistor to the control board can become pinched, melted, or chafed, causing two conductors to contact each other and create a short. This produces the same shorted-circuit reading as a failed sensor.

  3. 03

    Incoming water temperature above 75°C (167°F)

    Wiring / connection

    If the household water heater is set extremely high or a cross-connection exists in the plumbing, the actual incoming water temperature can exceed the 75°C threshold and legitimately trigger this code without any failed components.

  4. 04

    Faulty temperature sensor input on the control board

    Part replacement

    If the thermistor, wiring, and incoming water temperature all check out within spec, the control board's sensor input circuit may have failed internally. This is the least common cause and is confirmed only after all other circuit components test good.

See the test procedure for each cause

Frequently asked questions about 3-2

What does error code 3-2 mean on a Jenn-Air dishwasher?
Error code 3-2 means the control board has detected a shorted condition in the thermistor and OWI temperature sensing circuit. The control is reading an incoming water temperature above 75°C (167°F), which can result from a genuinely overheated water supply, a shorted thermistor, shorted wiring in the harness, or a failed temperature sensor input on the control board itself.
Is it safe to keep using my Jenn-Air dishwasher when error code 3-2 is displayed?
Running the dishwasher while 3-2 is active is not recommended. The control is detecting an abnormal temperature condition, and continuing to operate the machine without resolving the root cause risks exposing dishes, internal components, and the tub to potentially excessive heat. The dishwasher will typically halt operation on its own, and the fault should be diagnosed before running another cycle.
How do I fix error code 3-2 on a Jenn-Air dishwasher?
Start by checking your home water heater setting to confirm incoming water is below 75°C (167°F). Next, run the Service Diagnostic cycle to test the temperature sensor's operation. Then unplug the dishwasher and use a multimeter to check resistance and continuity across the thermistor and all wiring in the temperature sensing circuit. Replace any shorted wires or a thermistor that reads out of spec. If all components test good, the control board may need replacement.
How much does it cost to repair a Jenn-Air dishwasher with a 3-2 error code?
A replacement thermistor for a Jenn-Air dishwasher typically costs $20 to $60 for the part. If only wiring needs repair, cost is minimal. A new control board, which is the least likely fix, can run $150 to $350 or more for the part alone. Professional labor adds $100 to $200 depending on your area. DIY repair is practical if you can safely handle appliance wiring and use a multimeter to test components.
How do I test the thermistor on a Jenn-Air dishwasher showing a 3-2 code?
After unplugging the dishwasher or disconnecting power, locate the thermistor in the temperature sensing circuit and disconnect its harness connector. Use a multimeter set to resistance (ohms) to measure across the thermistor terminals. A shorted thermistor will read near zero ohms. Compare your reading to the spec in your model's service manual. If the sensor reads shorted or far outside the specified range, replace it. Also inspect the harness wires for visible damage or contact points that could cause a short.

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