Maytag Oven Error Code 4d42

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.

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.

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.

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.

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.