Maytag Range Error Code 4d42

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.

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.

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.

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.

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.