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Error code reference

Jenn-Air Oven Error Code 4d41

High reverse airflow fan rotation (high RPM) during cook or clean (upper oven, UH1/2 control only).

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High reverse airflow fan rotation (high RPM) during cook or clean (upper oven, UH1/2 control only).

First step from the service manual

Check fan motor; no action taken by control.

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

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What 4d41 means on a Jenn-Air oven

Error code 4d41 on a Jenn-Air oven signals that the convection or cooling fan in the upper oven cavity is spinning in reverse at high RPM during a cook or clean cycle. This code is specific to models equipped with a UH1 or UH2 control board. The control system monitors fan rotation direction and speed, and when it detects reverse airflow at elevated RPM, it logs this fault. Importantly, the control takes no automatic corrective action when this code appears, meaning the oven may continue operating while the fault is active.

The fan motor responsible for circulating air in the upper oven is the primary component under suspicion when 4d41 appears. Reverse rotation at high speed typically points to a motor that has developed an internal wiring fault, a failed start winding, or a problem with the motor control circuit that governs directional operation. In some cases, the motor itself may be mechanically sound but receiving an incorrect voltage signal from the control board, causing it to spin in the wrong direction.

Because the control board logs this fault without intervening, the technician must manually inspect and test the fan motor as the first diagnostic step. This includes checking the motor windings for resistance values outside of specification, verifying correct voltage delivery from the control board, and confirming that the fan blade is properly seated and not physically reversed on the motor shaft. A faulty control board sending incorrect phase or voltage signals can also produce this symptom even when the motor itself tests within normal parameters.

Source: manufacturer service documentation.

Common causes of 4d41

  1. 01

    Failed fan motor

    Part replacement

    An internally faulted fan motor with a failed start winding or shorted coil can cause reverse high-speed rotation. Testing the motor windings for proper resistance and checking for signs of overheating or burning is the first step.

  2. 02

    Incorrect motor wiring or connection

    Wiring / connection

    If the fan motor wiring harness is connected incorrectly or a connector has been reversed after a previous repair, the motor can spin backwards. Inspect all wiring connections at the motor for proper orientation and secure seating.

  3. 03

    Fan blade improperly seated on motor shaft

    Wiring / connection

    A fan blade mounted in the wrong orientation on the motor shaft can create the effect of reverse airflow even when the motor is spinning correctly. Visually inspect the blade positioning and confirm it matches the intended airflow direction.

  4. 04

    Faulty UH1 or UH2 control board

    Part replacement

    If the control board is sending incorrect phase or voltage signals to the fan motor, it can cause the motor to run in reverse at high speed even though the motor itself is undamaged. This is typically suspected after the motor and wiring have been ruled out.

  5. 05

    Damaged motor wiring harness

    Part replacement

    Chafed, burned, or shorted wiring in the harness between the control board and the fan motor can cause erratic motor behavior including reverse rotation. Inspect the full length of the wiring harness for visible damage or heat-related deterioration.

See the test procedure for each cause

Frequently asked questions about 4d41

What does 4d41 mean on a Jenn-Air oven?
Code 4d41 indicates that the upper oven fan is rotating in reverse at high RPM during a cook or clean cycle. This fault is specific to Jenn-Air ovens with UH1 or UH2 controls. The control board detects the abnormal fan behavior but does not take automatic corrective action, so the oven may continue to run. A technician should inspect the fan motor and related wiring to diagnose the underlying cause.
Can I fix error code 4d41 myself?
Some aspects of this diagnosis are accessible to a knowledgeable DIYer, such as checking whether the fan blade is properly seated on the motor shaft or inspecting wiring connections for obvious damage. However, testing motor windings and evaluating control board output requires a multimeter and familiarity with appliance electrical systems. Replacing the fan motor or control board is best handled by a qualified technician if you are not experienced with oven repairs.
Is it safe to use my Jenn-Air oven while code 4d41 is showing?
Because the control does not shut down the oven when this code appears, the appliance may continue to operate, but doing so is not recommended until the fault is diagnosed. A fan running in reverse at high speed can result in uneven cooking performance and may indicate a motor that is at risk of further failure. Avoid running self-clean cycles until the problem is resolved, as the high temperatures involved can accelerate motor damage.
Will resetting the oven clear error code 4d41?
Resetting the oven by cycling the circuit breaker may temporarily clear the displayed code, but if the underlying cause is not repaired, the fault will return once the oven enters a cook or clean cycle and the fan behavior is detected again. A reset is not a repair and should only be used to confirm whether the code reappears under normal operation.
How much does it cost to repair error code 4d41 on a Jenn-Air oven?
Repair costs vary depending on the root cause. A fan motor replacement typically runs in the range of $150 to $350 including parts and labor, while a control board replacement can cost $200 to $500 or more depending on the specific model. If the issue is a loose wiring connection or improperly seated fan blade, a service call fee alone may cover the repair. Getting a diagnostic visit from a qualified technician is the best way to determine the exact cost.

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