Maytag Range Error Code 3d12

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.

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.

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.

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.

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.