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Error code reference

Kenmore Dishwasher Error Code 8-4

Drain motor electrical problem

Kenmore codesKenmore dishwasher codes

Drain motor electrical problem — loose connection in drain motor circuit, open drain motor winding, open fuse on control to drain motor, faulty drain motor drive circuit, or faulty drain motor.

First step from the service manual

Unplug dishwasher or disconnect power and check resistances of drain motor winding and all connections in the drain circuit. Refer to fuse service & diagnostic checks.

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

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What 8-4 means on a Kenmore dishwasher

Error code 8-4 on a Kenmore dishwasher indicates the control board has detected an electrical fault in the drain motor circuit. The board monitors current and resistance through this circuit during drain cycles, and 8-4 triggers when it detects an anomaly such as an open winding in the drain motor, a blown fuse on the control board's drain motor drive circuit, a faulty drain motor drive circuit on the board itself, or a loose or broken connection somewhere along the drain motor wiring harness.

For homeowners, this code means your dishwasher's electronics found a problem with the part that pumps water out of the tub at the end of each wash cycle. When the drain motor or its electrical circuit fails, water may sit in the bottom of the tub and the cycle will not complete normally. The machine stops and displays 8-4 rather than risk running a motor with a damaged circuit.

The first diagnostic step is to disconnect power and measure the resistance across the drain motor windings with a multimeter, then inspect every connector in the drain circuit for corrosion, looseness, or burned contacts. A blown control board fuse is also a common culprit and is checked as part of the board's fuse service diagnostic procedure.

Source: manufacturer service documentation.

Common causes of 8-4

  1. 01

    Loose or corroded drain motor wiring connection

    Wiring / connection

    Vibration over time can loosen the connectors on the drain motor wiring harness, and moisture exposure can corrode the terminals. A broken or corroded connection creates an open circuit that triggers the 8-4 code.

  2. 02

    Open drain motor winding

    Part replacement

    If the internal windings of the drain motor have burned out or broken, the motor will show an open circuit (infinite resistance) on a multimeter. This indicates the motor has failed and must be replaced to clear the code.

  3. 03

    Blown fuse on control board drain motor circuit

    Part replacement

    The control board has a dedicated fuse protecting the drain motor drive circuit. A power surge or motor overload can blow this fuse, cutting power to the drain motor and triggering the 8-4 fault.

  4. 04

    Faulty drain motor drive circuit on the control board

    Part replacement

    If the fuse is intact and the motor tests good, the drive circuit on the control board itself may have failed. A damaged drive circuit cannot properly energize the drain motor, causing the 8-4 error to appear even when the motor is functional.

See the test procedure for each cause

Frequently asked questions about 8-4

What does error code 8-4 mean on a Kenmore dishwasher?
Error code 8-4 means the control board has detected an electrical problem in the drain motor circuit. The fault could be a loose wiring connection, an open winding inside the drain motor, a blown fuse on the control board, or a failed drain motor drive circuit. Unplugging the dishwasher and testing the drain motor's winding resistance with a multimeter is the recommended first step.
How do I fix error code 8-4 on a Kenmore dishwasher?
Start by disconnecting power to the dishwasher and inspecting all wiring connectors in the drain motor circuit for looseness or corrosion. Use a multimeter to measure the resistance of the drain motor windings; an open reading (OL or infinite) means the motor needs replacement. Also check the fuse on the control board's drain motor circuit. If the motor and wiring test good but the code persists, the control board's drain motor drive circuit has likely failed and the board will need to be replaced.
Can I still use my Kenmore dishwasher with the 8-4 error code active?
Running the dishwasher with an 8-4 error active is not advisable. Because this fault is in the drain motor circuit, the dishwasher will likely be unable to complete a drain cycle, leaving standing water in the tub. Continuing to run cycles in this condition can promote mold growth and may allow water to overflow or leak. Diagnose and repair the fault before resuming normal use.
How much does it cost to fix a Kenmore dishwasher 8-4 error?
Repair cost depends on which component has failed. Cleaning or reseating a loose connector costs nothing beyond your time. A replacement drain motor typically runs $40 to $100 in parts, and a replacement control board ranges from $80 to $200 depending on the model. If you hire a technician, expect to add $80 to $150 in labor. Testing the wiring and motor yourself first can help you avoid unnecessary parts purchases.
How do I test the drain motor on a Kenmore dishwasher showing code 8-4?
Disconnect power to the dishwasher before any testing. Locate the drain motor and unplug its wiring harness, then set a multimeter to measure resistance (ohms) and probe the motor's two terminals. A healthy drain motor winding typically shows a low, finite resistance reading; an open reading (OL or no continuity) confirms the winding has failed and the motor must be replaced. Also check each connector in the harness for corrosion or damage before concluding the motor itself is at fault.

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