Maytag Oven Error Code 4d31

Error code 4D31 means the oven's control board has detected that the reverse airflow fan in the upper or single oven cavity is running when it is supposed to be off. This is called a reverse airflow fan state error. The control board monitors whether the fan's actual state matches its commanded state, and 4D31 is triggered when those two states do not agree.

The 4D31 code does not trigger an automatic shutdown, so the oven may still operate. However, a fan running when it should be off can affect cooking performance and airflow management inside the oven. Running the appliance with an undiagnosed relay or wiring fault also carries a risk of electrical damage over time. It is advisable to limit use and address the fault before extended cooking sessions.

Power-cycling the oven by disconnecting it from power for a few minutes may clear the code temporarily, but the 4D31 error will return if the underlying fault is still present. The UH control board and H1/H2 control take no automatic corrective action for this code, so the fan relay, wiring, or board itself must be physically inspected and repaired to permanently resolve it.

Start by inspecting the fan relay and the wiring harness connected to the reverse airflow fan. Check for any visible damage, shorts, or loose connections along the wiring. If the wiring looks intact, test the relay itself to see if its contacts are stuck closed. Replacing a faulty relay or repairing damaged wiring resolves most 4D31 cases. If the relay and wiring are both in good condition, the UH control board may need to be replaced, which is a more complex repair best handled by a technician familiar with oven control systems.

If the fix is a relay replacement, parts are typically inexpensive, often under $50, and a technician visit adds $100 to $200 depending on your area. If the wiring harness needs repair or replacement, costs can rise to the $150 to $300 range with labor. A UH control board replacement is the most expensive scenario, with the board itself ranging from $150 to $400 and labor on top of that. Diagnosing the fault first, starting with the relay and wiring, can prevent spending on unnecessary parts.