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Error code reference

Jenn-Air Dishwasher Error Code 3-1

Open thermistor/OWI temperature sensing circuit

Jenn-Air codesJenn-Air dishwasher codes

Open thermistor/OWI temperature sensing circuit — open connection or component in Temperature Sensing Circuit, open or faulty temperature sensor, or faulty temperature sensor input on control.

First step from the service manual

1. Check operation of temperature sensor in Service Diagnostic Cycle. 2. Unplug dishwasher or disconnect power. 3. Check all components and connections in the Temperature Sensing Circuit with meter. Fix/replace open connection/part.

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

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What 3-1 means on a Jenn-Air dishwasher

Error code 3-1 on a Jenn-Air dishwasher indicates the control board has detected an open circuit in the Temperature Sensing Circuit. Specifically, the board is not receiving a valid signal from the thermistor or OWI (Optical Water Indicator) temperature sensor. An open circuit means the electrical path is broken somewhere between the sensor and the control board input, which prevents the board from reading water or air temperature during the wash cycle. This could be caused by a disconnected wire, a broken connector, a failed thermistor, or a faulty temperature sensor input on the control board itself.

For homeowners, this error means your dishwasher's temperature-monitoring system has lost contact with the sensor that tracks water heat during washing. Without accurate temperature data, the control board cannot properly regulate the wash cycle, so the dishwasher stops and displays this code rather than run a potentially ineffective or unsafe cycle. The fix usually involves checking the wiring between the sensor and control board and testing or replacing the thermistor. In most cases, the sensor or a damaged wire connection is the root cause, not the control board itself.

Source: manufacturer service documentation.

Common causes of 3-1

  1. 01

    Disconnected or damaged wiring connection in the Temperature Sensing Circuit

    Wiring / connection

    A loose, corroded, or broken wire connector between the thermistor and the control board creates an open circuit. This is the most common trigger for code 3-1 and should be inspected first before replacing any parts.

  2. 02

    Failed or open thermistor (temperature sensor)

    Part replacement

    The thermistor itself can fail internally, breaking the circuit and causing it to read as open. A meter check across the thermistor terminals will show infinite or no resistance when the component has failed.

  3. 03

    Faulty OWI sensor with temperature sensing function

    Part replacement

    The OWI (Optical Water Indicator) on some Jenn-Air dishwasher models includes temperature sensing capability. If this unit fails or loses its connection, it can cause a 3-1 code alongside water sensing issues.

  4. 04

    Faulty temperature sensor input on the control board

    Part replacement

    If the wiring and thermistor both test correctly with a meter, the control board's temperature sensor input circuit may have failed. This is the least likely cause but should be considered after all other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about 3-1

What does error code 3-1 mean on a Jenn-Air dishwasher?
Code 3-1 means the control board has detected an open circuit in the Temperature Sensing Circuit. The board is not receiving a valid signal from the thermistor or OWI temperature sensor. This can be caused by a disconnected wire, a broken connector in the circuit, or a failed thermistor.
How do I fix error code 3-1 on my Jenn-Air dishwasher?
Start by running the Service Diagnostic Cycle to observe temperature sensor behavior. Then unplug the dishwasher and use a multimeter to check all wiring connections and components in the Temperature Sensing Circuit for continuity. Reconnect any loose connectors and replace any wiring or components that show an open reading. If the wiring and sensor both check out, the control board input may be faulty and the board would need replacement.
Can I still use my Jenn-Air dishwasher with a 3-1 error code showing?
Running the dishwasher while code 3-1 is active is not recommended. Without a functioning temperature sensor signal, the control board cannot monitor water temperature, which means the wash cycle may not heat water to the correct level for proper cleaning and sanitation. The dishwasher will likely stop mid-cycle or refuse to start. Resolve the error before regular use.
How much does it cost to fix a 3-1 error on a Jenn-Air dishwasher?
If the fix is simply reseating a loose wire connector, there is no parts cost. A replacement thermistor typically costs between $20 and $60 depending on the model. An OWI sensor can range from $30 to $80. If the control board is at fault, parts alone can run $150 to $300 or more. Professional labor adds $100 to $200 on top of parts, so diagnosing and fixing the wiring yourself first makes financial sense before committing to board replacement.
How do I test the thermistor on a Jenn-Air dishwasher showing code 3-1?
Unplug the dishwasher, then disconnect the thermistor from its wiring harness. Set a multimeter to measure resistance (ohms) and probe both terminals of the thermistor. At room temperature, a functioning thermistor should show a measurable resistance value, typically in the range of several thousand ohms depending on the model spec. A reading of infinite resistance or open line (OL) confirms the thermistor has failed and needs replacement. Check the tech sheet inside your dishwasher door panel for the exact resistance specification for your model.

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