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Error code reference

Jenn-Air Dishwasher Error Code 4-2

Motor problems force cycle to start and stop repeatedly.

Jenn-Air codesJenn-Air dishwasher codes

Motor problems force cycle to start and stop repeatedly.

First step from the service manual

Refer to Service Error Codes table for wash motor diagnostics.

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

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  • 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
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What 4-2 means on a Jenn-Air dishwasher

Error code 4-2 on a Jenn-Air dishwasher indicates the control board has detected abnormal motor behavior during a wash cycle. Specifically, the wash motor is experiencing operational failures that cause the cycle to repeatedly start and stop rather than run continuously. The control board monitors motor performance in real time, and when it detects this interruption pattern, it throws the 4-2 fault. Diagnostics begin with the Service Error Codes table for wash motor-specific testing, which will help isolate whether the fault is electrical, mechanical, or control-related.

For homeowners, this code means the dishwasher's main motor, which circulates water through the spray arms during a wash cycle, is struggling to run properly. Instead of completing a wash cycle smoothly, the machine keeps cutting out and restarting. This can sound like the dishwasher repeatedly trying to kick on, running briefly, then going quiet. The dishes will not get cleaned effectively while this code is active. The root cause could range from a failing motor and bad wiring to a blocked pump or a control board issue, so pinpointing the specific failure point is necessary before replacing any parts.

Source: manufacturer service documentation.

Common causes of 4-2

  1. 01

    Failing wash motor

    Part replacement

    The wash motor itself may be worn out or developing an internal fault, causing it to lose power or seize mid-cycle. This produces the characteristic start-stop pattern the control board detects and logs as 4-2.

  2. 02

    Blocked or jammed motor pump assembly

    Wiring / connection

    Debris such as broken glass, food particles, or a foreign object lodged in the pump can mechanically restrict the motor and cause it to stall repeatedly. The motor may still be functional but cannot run freely due to the obstruction.

  3. 03

    Damaged or loose wiring harness to the wash motor

    Part replacement

    A corroded, pinched, or disconnected wiring connection between the control board and the wash motor can cause intermittent power delivery, producing the erratic start-stop behavior. Inspect the motor connector and harness routing for damage or looseness.

  4. 04

    Faulty control board

    Part replacement

    If the control board is sending irregular voltage signals to the wash motor, the motor will respond erratically even if it is mechanically sound. This is the least common cause and should only be considered after the motor, pump, and wiring have been tested and cleared.

See the test procedure for each cause

Frequently asked questions about 4-2

What does error code 4-2 mean on a Jenn-Air dishwasher?
Error code 4-2 means the control board has detected that the wash motor is causing the cycle to start and stop repeatedly instead of running continuously. The dishwasher is unable to complete a normal wash cycle in this condition. The fault points to a problem in the wash motor system, which includes the motor itself, the pump assembly, and the associated wiring.
Can I still use my Jenn-Air dishwasher while error code 4-2 is active?
Running the dishwasher with an active 4-2 code is not advisable. Because the wash motor is stopping and starting abnormally, the appliance will not clean dishes effectively and the cycle will not complete properly. Continuing to run the unit while a motor fault is present can also put additional stress on the motor and control board, potentially worsening the damage and increasing repair costs.
How do I fix error code 4-2 on a Jenn-Air dishwasher?
Start by checking the pump assembly for blockages such as debris or foreign objects, which is a no-cost repair if that turns out to be the cause. If the pump is clear, use the Service Error Codes table in the Jenn-Air service manual to run wash motor diagnostics. This will help you determine whether the problem is the motor itself, the wiring harness, or the control board. A technician with a multimeter can test motor resistance and voltage supply to pinpoint the fault before ordering parts.
How much does it cost to repair a Jenn-Air dishwasher with a 4-2 error code?
Cost depends on the failed component. Clearing a pump blockage costs nothing beyond your time. A replacement wash motor for a Jenn-Air dishwasher typically runs between $80 and $200 for the part, with labor adding $100 to $200 if you hire a technician. A control board replacement is more expensive, often $150 to $350 for the part. Getting a proper diagnosis before purchasing parts will prevent spending money on the wrong component.
Will resetting my Jenn-Air dishwasher clear error code 4-2?
A reset may temporarily clear the 4-2 code, but if an underlying motor problem exists, the code will return as soon as the dishwasher attempts to run a cycle. To reset, cut power to the dishwasher at the circuit breaker for one to two minutes, then restore power. If 4-2 comes back immediately or within the first few minutes of a cycle, the motor system has a genuine fault that requires diagnosis and repair.

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