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Error code reference

Maytag Oven Error Code 4d42

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

Maytag codesMaytag oven codes

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

First step from the service manual

Check convection fan motor and control board.

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 4d42 means on a Maytag oven

Error code 4D42 on a Maytag lower oven with a UH control board indicates the control detected abnormally high RPM from the reverse airflow convection fan motor during a cook or clean cycle. The board monitors fan rotation speed and direction; when reverse airflow fan speed exceeds the acceptable threshold, the control triggers this fault and disables all cooking functions for that cavity. This is a UH control-specific fault, meaning it applies only to the lower oven cavity in applicable dual-cavity configurations.

In plain terms, the convection fan inside your lower oven is spinning too fast in the reverse direction. Convection ovens use a fan to circulate hot air, and that fan cycles through directional patterns during operation. When it reverses and spins at a higher RPM than the control board expects, the oven shuts down cooking to protect itself and the cavity components.

Because the oven disables all cooking functions for the affected cavity when this code is active, you cannot bake, broil, or run a self-clean cycle until the fault is resolved. The starting point for diagnosis is inspecting the convection fan motor for mechanical or electrical faults and checking the control board for signs of failure or incorrect output signals to the motor.

Source: manufacturer service documentation.

Common causes of 4d42

  1. 01

    Faulty convection fan motor

    Part replacement

    A worn or failing fan motor can lose speed regulation, causing it to spin at uncontrolled RPM during the reverse phase of its cycle. This is the most direct cause of the high-speed condition the control board detects.

  2. 02

    Defective UH control board

    Part replacement

    If the control board is sending incorrect voltage or duty-cycle signals to the convection fan motor, it can drive the motor beyond its intended speed. A malfunctioning board may misread motor feedback or over-drive the motor during the reverse airflow phase.

  3. 03

    Damaged or shorted wiring harness between control board and fan motor

    Wiring / connection

    A short or damaged wire in the harness connecting the UH control board to the convection fan motor can cause erratic motor behavior, including uncontrolled speed spikes that register as a 4D42 fault.

  4. 04

    Fan blade obstruction or mechanical binding

    Wiring / connection

    A foreign object, grease buildup, or a bent fan blade can cause the motor to work against resistance and behave erratically, potentially generating speed feedback that the control board interprets as out-of-range.

See the test procedure for each cause

Frequently asked questions about 4d42

What does error code 4D42 mean on a Maytag oven?
Error code 4D42 means the UH control board in the lower oven detected that the reverse airflow convection fan motor was spinning at a higher RPM than allowed during a cook or clean cycle. The control board monitors fan speed and direction, and when the reverse-phase speed exceeds its acceptable range, it triggers this fault and shuts down all cooking functions for the lower cavity.
Can I still use my Maytag oven with error code 4D42 active?
No. When 4D42 is active, the oven disables all cooking functions for the lower cavity, including bake, broil, and self-clean. You cannot bypass this lockout from the control panel. The oven must be diagnosed and repaired before normal operation resumes.
How do I fix error code 4D42 on my Maytag oven?
Start by disconnecting power to the oven for at least 5 minutes to clear the fault, then restore power and test. If the code returns, inspect the convection fan motor in the lower oven for mechanical issues such as a blocked or bent fan blade and check the wiring harness between the fan motor and the UH control board for damage or loose connections. If the motor and wiring check out, the control board itself may need to be replaced. A multimeter can be used to verify motor winding resistance against spec. If you are not comfortable testing live appliance circuits, a certified technician should handle this repair.
How much does it cost to fix a 4D42 error on a Maytag oven?
If the convection fan motor is the cause, replacement motors for Maytag lower oven configurations typically range from $60 to $130 for the part, plus one to two hours of labor if a technician is performing the repair. A UH control board replacement is more expensive, usually $150 to $350 for the part. DIY repair is possible for the fan motor if you are comfortable disconnecting power, accessing the back panel or inner oven cavity, and handling basic wiring connections. Control board replacement requires more care to avoid damage to connectors and adjacent components.
Is error code 4D42 specific to the lower oven on Maytag double oven models?
Yes. Code 4D42 is specific to the lower oven cavity and applies only to units equipped with a UH control board. It reflects the reverse airflow convection fan behavior in that cavity specifically. If your upper oven is functional, this fault does not affect it, but the lower cavity cooking functions will remain disabled until the fault is resolved.

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