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Error code reference

Maytag Range Error Code 3d12

Lower oven meat probe sensor resistance is infinite (open circuit)

Maytag codesMaytag range codes

Lower oven meat probe sensor resistance is infinite (open circuit) - disables all cooking functions for the cavity.

First step from the service manual

Check meat probe sensor continuity.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What 3d12 means on a Maytag range

Error code 3d12 on a Maytag range indicates that the control board has detected an open circuit condition in the lower oven cavity temperature sensor. The sensor's resistance has risen to infinity, which means the control board is receiving no usable signal from the sensor. Without a valid temperature reading, the control system cannot regulate heat in the lower oven cavity and triggers this fault to prevent unsafe or uncontrolled operation. The most likely cause is a failed RTD temperature sensor or a break in the wiring between the sensor and the control board.

The oven temperature sensor is a probe mounted inside the lower oven cavity, usually at the rear wall. It sends a resistance signal to the control board so the oven knows when to cycle the heating elements on and off. When this sensor reads as open, the control board is essentially blind to the oven's actual temperature. The oven cannot safely operate in this state.

Diagnosing 3d12 starts with measuring the sensor's resistance using a multimeter. A working oven temperature sensor typically reads around 1,080 to 1,100 ohms at room temperature. A reading of infinite ohms (OL) confirms the sensor has failed internally or the wiring circuit to it is broken.

Source: manufacturer service documentation.

Common causes of 3d12

  1. 01

    Failed lower oven temperature sensor

    Part replacement

    The RTD sensor probe itself has broken internally, causing an open circuit and infinite resistance. This is the most common cause of 3d12 and requires replacing the sensor.

  2. 02

    Broken or disconnected sensor wiring harness

    Part replacement

    The wiring between the temperature sensor and the control board has a break, burn, or loose connector, interrupting the circuit and causing the control board to read infinite resistance. Inspect the full length of the wire and connectors at both ends.

  3. 03

    Burned sensor connector at control board

    Part replacement

    Heat or arcing can damage the connector pins where the sensor harness plugs into the control board, creating an open circuit even if the sensor itself is intact. Check for melted plastic, corrosion, or blackened terminals at this connector.

  4. 04

    Faulty control board

    Part replacement

    If the sensor and all wiring test correctly, the control board's sensor input circuit may have failed, causing it to misread the signal as open. This is the least likely cause and should only be suspected after confirming the sensor and harness are good.

See the test procedure for each cause

Frequently asked questions about 3d12

What does error code 3d12 mean on a Maytag range?
Error code 3d12 means the control board detected an open circuit in the lower oven cavity temperature sensor. The sensor's resistance is reading as infinite, which tells the control board it has lost all temperature feedback from the lower oven. This is typically caused by a failed sensor probe or a break in the wiring connected to it.
How do I fix error code 3d12 on a Maytag range?
Start by unplugging the range and using a multimeter to measure the resistance of the lower oven temperature sensor at its connector. At room temperature, a working sensor reads roughly 1,080 to 1,100 ohms. A reading of infinite ohms (OL) means the sensor has failed and needs to be replaced. If the sensor tests good, inspect the wiring harness and connector for breaks, burns, or loose pins before suspecting the control board.
Can I still use my Maytag range with error code 3d12 active?
You should not use the lower oven while 3d12 is active. Without a working temperature sensor, the control board cannot regulate heat in the lower oven cavity, which creates a risk of overheating or uncontrolled temperatures. The surface burners on a gas or electric range may still function normally, but the lower oven should remain off until the fault is resolved.
How much does it cost to fix error code 3d12 on a Maytag range?
If the lower oven temperature sensor is the cause, the part typically costs between $20 and $60 depending on the model, and most homeowners can replace it themselves in under 30 minutes using a basic screwdriver. If the wiring harness is damaged, a replacement harness runs $30 to $80. A new control board is significantly more expensive, ranging from $150 to $350 for parts alone, and professional labor adds $100 to $200 on top of that. Confirm the sensor is actually faulty before purchasing any parts.
Is the lower oven temperature sensor on a Maytag range easy to replace yourself?
Yes, replacing the lower oven temperature sensor is one of the more accessible oven repairs. The sensor is typically held in place by one or two screws on the rear wall inside the oven cavity and plugs into a harness that can be accessed by pulling the range away from the wall or reaching through the oven. Confirm the resistance of the new sensor before installing it to verify you have the correct part for your model.

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