mypros+
Error code reference

Kenmore Dishwasher Error Code 3-1

Open connection or component in temperature sensing circuit; open or faulty temperature sensor; faulty…

Kenmore codesKenmore dishwasher codes

Open connection or component in temperature sensing circuit; open or faulty temperature sensor; faulty temperature sensor input on control.

First step from the service manual

Check operation of temperature sensor in service diagnostics cycle. Unplug and check all components and connections in temperature sensing circuit with meter.

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

MyPros+ Max

Get the full diagnostic procedure for 3-1.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What 3-1 means on a Kenmore dishwasher

Error code 3-1 on a Kenmore dishwasher indicates the control board has detected an open connection or fault in the temperature sensing circuit. This means the control is receiving no valid signal from the temperature sensor (also called a thermistor), which monitors wash and rinse water temperature. The fault can originate from a broken wire or connector in the harness leading to the sensor, a failed temperature sensor itself, or a faulty temperature sensor input on the control board. Diagnosing correctly requires checking the circuit end-to-end with a multimeter before replacing any parts.

For homeowners, the temperature sensor is a small component inside the dishwasher tub that tells the control board how hot the water is during a wash cycle. Without a good reading from this sensor, the dishwasher cannot properly regulate water heating, and it will stop the cycle and display 3-1 rather than risk incomplete cleaning or overheating. The problem is most often a failed sensor or a loose wire connection rather than the control board itself. In many cases this is a repairable issue without replacing the entire control board.

Source: manufacturer service documentation.

Common causes of 3-1

  1. 01

    Failed temperature sensor (thermistor)

    Part replacement

    The temperature sensor itself has failed and is presenting an open circuit to the control board. A faulty thermistor will read out of range or show infinite resistance when tested with a multimeter, confirming it needs replacement.

  2. 02

    Broken or disconnected wiring in temperature sensing circuit

    Wiring / connection

    A wire in the harness between the temperature sensor and the control board has broken, corroded, or pulled loose from a connector. This open connection prevents any signal from reaching the control, triggering the 3-1 code even if the sensor itself is functioning correctly.

  3. 03

    Corroded or damaged connector pins

    Wiring / connection

    The connector terminals at the temperature sensor or at the control board end of the harness can corrode or become damaged over time, creating an intermittent or permanent open circuit. Inspecting and cleaning or re-pinning connectors may resolve the fault without replacing the sensor.

  4. 04

    Faulty temperature sensor input on the control board

    Part replacement

    If the wiring harness and temperature sensor both test within spec using a multimeter but the 3-1 code persists, the input circuit on the control board itself may have failed. This is the least likely cause and should only be considered after all other components have been verified.

See the test procedure for each cause

Frequently asked questions about 3-1

What does error code 3-1 mean on a Kenmore dishwasher?
Error code 3-1 means the control board has detected an open circuit in the temperature sensing circuit. The dishwasher is not receiving a valid signal from the temperature sensor (thermistor) that monitors water temperature. The cause is typically a failed sensor, a broken wire in the harness, or a corroded connector rather than the control board itself.
How do I fix error code 3-1 on a Kenmore dishwasher?
Start by running the service diagnostics cycle to check sensor operation, then unplug the dishwasher and use a multimeter to test resistance across the temperature sensor and continuity through the wiring harness. A functioning thermistor will show a measurable resistance that changes with temperature; an open reading confirms a bad sensor. If the sensor and wiring both test good, the control board input is suspect. Most repairs involve replacing the thermistor or repairing a connector, both of which are manageable DIY tasks with basic tools.
Can I still use my Kenmore dishwasher when it shows a 3-1 error?
Running the dishwasher with an active 3-1 code is not recommended. Without a functioning temperature sensor, the control board cannot monitor water temperature, which means the dishwasher may not heat water properly or may run cycles that do not fully sanitize dishes. Continuing to operate it could also prevent the fault from being properly diagnosed and may result in incomplete wash cycles or the machine stopping mid-cycle.
How much does it cost to fix a Kenmore dishwasher 3-1 error code?
If the temperature sensor (thermistor) is the cause, the part typically costs between $15 and $40 depending on the specific Kenmore model. If a wiring harness section needs replacement, parts are in a similar range. DIY repair is achievable for most homeowners comfortable with a multimeter and basic disassembly. A professional repair technician will add a service call and labor fee, usually bringing the total to $100 to $200. If the control board input has failed, board replacement costs significantly more, making professional diagnosis worthwhile before purchasing that part.
How do I test the temperature sensor on a Kenmore dishwasher with error code 3-1?
Unplug the dishwasher, locate the temperature sensor inside the tub (usually near the bottom), and disconnect its wiring connector. Set a multimeter to resistance (ohms) mode and probe the two sensor terminals. At room temperature, a working thermistor should show a resistance reading rather than an open line (OL) or infinite reading. You can also place the sensor in warm water and verify the resistance value changes as temperature increases. An open or unchanging reading confirms the sensor has failed and needs replacement.

Related Kenmore dishwasher codes

All Kenmore dishwasher codes
View all 80 Kenmore dishwasher codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass