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Error code reference

Maytag Oven Error Code 4d31

Fan state error

Maytag codesMaytag oven codes

Fan state error — fan is on when it is supposed to be off, detected during cook or clean active mode.

First step from the service manual

Check cooling fan circuit. Control takes no action.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What 4d31 means on a Maytag oven

Error code 4D31 indicates the UH (upper/single oven) control board has detected that the reverse airflow fan is running when the control has commanded it to be off. This is a fan state mismatch: the board's feedback circuit is reading the fan as active during a period it should be idle. The diagnostic path starts at the fan relay and associated wiring, since the relay is the component responsible for switching the fan circuit on and off. Notably, neither the H1/H2 control nor the UH control takes any automatic corrective action when this code is set, meaning the oven will not self-correct.

For homeowners, this means the oven has detected that its reverse airflow fan is not responding correctly to commands from the control board. The fan is supposed to be off, but the board is reading it as on. This could be caused by a stuck relay, a wiring short that is feeding voltage to the fan circuit, or in some cases a failed control board that is misreading the fan's state. The oven flags this condition but does not shut itself down automatically, so the error will persist until the underlying cause is diagnosed and corrected.

Source: manufacturer service documentation.

Common causes of 4d31

  1. 01

    Stuck or shorted fan relay

    Part replacement

    The fan relay controls power to the reverse airflow fan. If the relay contacts are welded shut or shorted internally, the fan receives power even when the control board commands it off, triggering the 4D31 state mismatch.

  2. 02

    Wiring short in fan circuit

    Part replacement

    A damaged or pinched wire in the fan wiring harness can create an unintended current path that keeps the fan circuit energized. This would cause the UH control to read the fan as running when it should be off.

  3. 03

    Fan feedback signal error

    Wiring / connection

    If the wire carrying the fan's operational feedback signal to the UH control board is shorted or damaged, the board may falsely interpret the fan as active even when it is not receiving power.

  4. 04

    Failed UH control board

    Part replacement

    If the relay and all associated wiring check out correctly, the UH control board itself may have an internal fault causing it to misread the fan state. A failed board will require replacement to resolve the 4D31 code.

See the test procedure for each cause

Frequently asked questions about 4d31

What does error code 4D31 mean on a Maytag oven?
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.
How do I fix error code 4D31 on a Maytag oven?
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.
Is it safe to use my Maytag oven with a 4D31 error code?
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.
How much does it cost to fix a Maytag oven 4D31 error?
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.
Can I clear the 4D31 code by resetting my Maytag oven?
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.

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