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Error code reference

Maytag Range Error Code 4d12

Door switch is not closed when door is locked

Maytag codesMaytag range codes

Door switch is not closed when door is locked - disables convection, cleaning, and locking functions; turns off lighting and disables door-switch-controlled lighting.

First step from the service manual

Check door switch operation and wiring.

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

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What 4d12 means on a Maytag range

Error code 4d12 on a Maytag range signals a door switch position failure specific to the lower oven. The control board commands the door lock mechanism to engage, then reads the door switch feedback signal to confirm the door is fully latched. When the switch does not report a closed position after the lock cycle completes, the board logs 4d12. This is a positional mismatch fault. The lock actuator may have moved, but the switch is not confirming contact.

For homeowners, this means the oven's control system tried to lock the lower oven door, typically during a self-clean cycle, and could not verify that the door was actually secured. The door switch is a small sensor that tells the control board whether the door latch is in the closed position. If this signal never arrives, the oven will stop the cycle and display the error to prevent running a high-heat operation with an unconfirmed door state.

The most common sources of this fault are a failed door switch, damaged wiring between the switch and control board, or a misaligned door latch that prevents the switch from making contact. Physical obstructions around the door hinge or latch assembly can also prevent full closure.

Source: manufacturer service documentation.

Common causes of 4d12

  1. 01

    Failed lower oven door switch

    Part replacement

    The door switch itself has worn contacts or an internal failure and no longer sends a closed signal to the control board, even when the latch is physically engaged. This is the most likely cause when wiring checks out normal.

  2. 02

    Damaged or disconnected wiring harness to door switch

    Wiring / connection

    The wiring between the door switch and the control board may have a broken wire, loose connector, or pinched harness, interrupting the closed-position signal. This can occur from repeated door use or heat exposure near the latch area.

  3. 03

    Misaligned door latch mechanism

    Wiring / connection

    If the lower oven door is out of alignment or the latch striker is shifted, the lock actuator may travel to its end position without pressing the door switch plunger far enough to register contact. Realigning the door or adjusting the latch may resolve this without part replacement.

  4. 04

    Faulty door lock motor or latch assembly

    Part replacement

    If the door lock motor is weak or the latch assembly is mechanically binding, the latch may not fully travel to the locked position, leaving the switch unable to close. This requires replacing the door lock assembly.

See the test procedure for each cause

Frequently asked questions about 4d12

What does error code 4d12 mean on a Maytag range?
Code 4d12 means the control board detected a door switch position failure on the lower oven. Specifically, the door switch did not register a closed signal after the door lock was commanded to engage. The board expects confirmation from the door switch that the latch is secured, and when that signal is absent, it logs 4d12 and halts the operation.
How do I fix error code 4d12 on my Maytag range?
Start by inspecting the lower oven door switch and its wiring harness for loose connectors, broken wires, or visible damage. Check that the door is properly aligned and closes without resistance. If the wiring is intact and the door closes squarely, test the door switch with a multimeter for continuity in the closed position. A switch that does not show continuity when pressed needs replacement. If the switch tests good, inspect the door lock motor and latch assembly for mechanical binding.
Is it safe to use my Maytag range with a 4d12 error code?
Standard bake and broil functions may remain operational, but you should not attempt to run a self-clean cycle while 4d12 is active. The code indicates the control board cannot confirm the lower oven door is locked, which is a safety requirement for self-clean. Running high-heat cycles with an unverified door latch position is a safety risk. Repair the door switch or latch fault before using the self-clean feature.
How much does it cost to fix a 4d12 error on a Maytag range?
If the fix is a wiring connection or door realignment, there is no parts cost, only your time. A replacement lower oven door switch typically costs $15 to $50 in parts depending on the specific model. A full door lock motor and latch assembly runs $40 to $120 in parts. Professional labor adds $100 to $200 depending on your area. If the issue is a loose connector, this is a reasonable DIY repair for most homeowners with basic tools.
Can a dirty or obstructed door latch cause the 4d12 error code?
Yes. Grease buildup or debris around the door latch area can prevent the latch from fully engaging, which keeps the door switch from reaching the closed position. Cleaning the latch mechanism and the area around the door frame with a degreaser is worth doing before replacing any parts. If cleaning resolves the mechanical binding and the switch actuates properly, the error code should clear on the next cycle.

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