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Error code reference

Maytag Range Error Code 4d42

High Reverse Airflow Fan rotation (high RPM) on lower oven cavity.

Maytag codesMaytag range codes

High Reverse Airflow Fan rotation (high RPM) on lower oven cavity.

First step from the service manual

Check 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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What 4d42 means on a Maytag range

Error code 4d42 on a Maytag range indicates the control board has detected abnormally high RPM from the reverse airflow fan motor in the lower oven cavity. The control board monitors fan rotation speed continuously, and when the fan spins significantly faster than its rated speed range, the board logs this fault. This typically points to a problem with the fan motor itself, a failure in the motor control circuit, or a control board output that is driving the motor beyond its intended speed parameters.

For homeowners, the reverse airflow fan in your lower oven cavity is responsible for managing air circulation and cooling within that compartment. When this fan spins too fast, it can indicate a motor that has lost its speed regulation, a wiring issue sending incorrect voltage to the motor, or a control board that is not properly limiting the fan signal. You may notice unusual noise from the lower oven area, inconsistent oven temperatures, or the range shutting down to protect itself. The oven may restrict operation while this code is active to prevent potential damage from the out-of-spec fan behavior.

Source: manufacturer service documentation.

Common causes of 4d42

  1. 01

    Faulty reverse airflow fan motor (lower oven cavity)

    Part replacement

    The fan motor itself may have failed internally, losing the ability to regulate its own rotation speed and spinning beyond normal RPM limits. A motor with worn brushes, a failing speed sensor, or internal winding damage can exhibit this behavior.

  2. 02

    Control board sending incorrect voltage to fan motor

    Part replacement

    If the control board is outputting voltage above the fan motor's rated specification, the motor will spin faster than intended and trigger this fault code. A failing relay or driver circuit on the board is the typical culprit.

  3. 03

    Damaged or shorted wiring harness to fan motor

    Wiring / connection

    A wiring harness with damaged insulation or a short circuit can alter the voltage and signal reaching the fan motor, causing it to operate at incorrect speeds. Inspect the harness routing near heat sources in the lower cavity for melting or chafing.

  4. 04

    Fan blade obstruction causing motor speed feedback error

    Wiring / connection

    Debris or a dislodged fan blade component can interfere with the motor's tachometer or speed sensor feedback loop, causing the control board to receive erroneous high-RPM readings even if the motor itself is functioning normally.

See the test procedure for each cause

Frequently asked questions about 4d42

What does error code 4d42 mean on a Maytag range?
Error code 4d42 means the control board has detected high reverse airflow fan rotation speed (high RPM) in the lower oven cavity. The board monitors the fan motor speed and triggers this code when the fan spins faster than its designed operating range. The most common sources are a failing fan motor, a bad control board, or a wiring issue between the two.
Is it safe to use my Maytag range while error code 4d42 is active?
Using the range with code 4d42 active is not recommended. An out-of-spec fan motor in the lower oven cavity can affect temperature regulation and, in some cases, indicates electrical conditions that could cause further component damage. Power the range off until the fan motor and control board have been inspected and the fault is resolved.
How do I fix error code 4d42 on a Maytag range?
Start by disconnecting power to the range and inspecting the lower oven cavity fan motor, its wiring harness, and the fan blade for visible damage, obstructions, or burned connectors. If the harness and fan blade are intact, test the fan motor for proper resistance and rotation. If the motor tests out of spec, replace it. If the motor checks out, the control board is likely sending incorrect voltage and will need to be tested or replaced. A technician with a multimeter can diagnose which component is responsible before ordering parts.
How much does it cost to fix a Maytag range with error code 4d42?
A replacement lower oven cavity fan motor typically costs between $30 and $90 for the part depending on the specific Maytag model. A control board replacement is more expensive, generally ranging from $150 to $350 for the part alone. If you hire a technician, expect a diagnostic fee of $75 to $150 plus labor, which can add another $100 to $200 on top of parts. A DIY repair is feasible for the fan motor replacement if you are comfortable working with appliance wiring and can locate your model's service manual.
Will resetting my Maytag range clear the 4d42 error code?
A power reset by unplugging the range or tripping its circuit breaker for 60 seconds may temporarily clear code 4d42, but the code will return if the underlying problem with the reverse airflow fan motor or control board is not corrected. Use the reset as a first step to confirm the code reappears, which helps verify the fault is not a one-time electronic glitch, then proceed with inspecting the fan motor and control board.

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