Maytag Oven Error Code 1d21

Code 1d21 means the control board detected a runaway temperature condition of 950°F or higher in the upper or single oven, with the door locked at the time. The control board also measured the oven temperature sensor resistance above 2787 ohms, which is out of the acceptable range. This typically signals a failed oven temperature sensor rather than an actual extreme heat event. The oven cancels any active cook function automatically when this code appears.

Start by unplugging the oven and using a multimeter to measure the resistance of the oven temperature sensor at its connector. At room temperature, a good sensor reads roughly 1080 to 1090 ohms. A reading above 2787 ohms confirms the sensor needs replacement. If the sensor tests within spec, inspect the wiring harness between the sensor and control board for burned or broken wires. Sensor replacement is a DIY-accessible repair on most Maytag models; control board replacement is more involved and may warrant a qualified appliance technician.

Yes, this is a common trigger point. The self-clean cycle runs the oven at very high temperatures with the door locked, which is exactly the condition described in the 1d21 code. The intense heat can degrade an oven temperature sensor that was already weakened, pushing its resistance reading above the 2787-ohm threshold. If 1d21 appears after self-clean, test the sensor resistance first before assuming any other component has failed.

No, you should not attempt to use the oven while 1d21 is active. The code indicates the temperature sensor is not reporting accurately, which means the control board cannot regulate oven heat reliably. Using the oven in this state risks overheating. Do not operate the oven until the sensor has been tested and replaced if necessary.

An oven temperature sensor for a Maytag oven typically costs between $20 and $60 for the part, and installation is manageable for most DIYers with basic tools. If a technician does the work, expect a total repair cost of $100 to $200 including labor. If the control board is at fault, the part alone can run $150 to $300 or more, making professional diagnosis worthwhile before purchasing the board.