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Error code reference

Maytag Oven Error Code 1d21

Aberrant temperature with door locked

Maytag codesMaytag oven codes

Aberrant temperature with door locked — sensor resistance exceeds 2662 ohms indicating abnormal reading with latch locked.

First step from the service manual

Check temperature sensor resistance; replace if >2662 ohms at normal temperature.

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

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What 1d21 means on a Maytag oven

Error code 1d21 on a Maytag oven indicates the control board has detected a runaway temperature condition in the upper or single oven cavity, with the oven door in a locked state. Specifically, the board registered a temperature at or above 950°F and confirmed an out-of-range oven temperature sensor resistance reading above 2787 ohms. When triggered, the control board immediately cancels any active cook function as a safety measure. The sensor resistance threshold is the key diagnostic data point here: a reading above 2787 ohms points to a failed or failing oven temperature sensor (RTD probe) rather than an actual extreme oven temperature.

For homeowners, this means the oven's internal thermometer is sending a signal to the control board suggesting temperatures far beyond any normal cooking range. The oven door being locked at the time of detection is relevant because this condition often occurs during or after a self-clean cycle, when both high heat and door locking are active. The oven shuts itself down to prevent damage or a fire hazard.

The most productive first step is measuring the oven sensor's resistance with a multimeter. A properly functioning sensor reads approximately 1080 to 1090 ohms at room temperature. A reading above 2787 ohms confirms the sensor has drifted out of spec or failed outright and needs replacement.

Source: manufacturer service documentation.

Common causes of 1d21

  1. 01

    Failed oven temperature sensor (RTD probe)

    Part replacement

    The oven temperature sensor has drifted out of its specified resistance range, reading above 2787 ohms. This causes the control board to interpret an extreme temperature condition even when the oven cavity is at a normal temperature.

  2. 02

    Damaged or shorted sensor wiring harness

    Part replacement

    The wiring harness connecting the oven temperature sensor to the control board may have burned insulation, a broken wire, or a loose connector, causing an artificially high resistance reading that mimics a failed sensor.

  3. 03

    Door lock mechanism stuck in locked position

    Part replacement

    If the door lock assembly fails to release after a self-clean cycle, the control board continues to see the door as locked while attempting to monitor temperature, which can contribute to triggering or sustaining the 1d21 condition.

  4. 04

    Faulty oven control board

    Part replacement

    In rare cases where the sensor and wiring test within spec, the control board itself may be misreading the sensor signal or failing to process resistance values correctly, producing a false 1d21 error.

See the test procedure for each cause

Frequently asked questions about 1d21

What does error code 1d21 mean on a Maytag oven?
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.
Is it safe to use my Maytag oven when error code 1d21 is showing?
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.
How do I fix error code 1d21 on a Maytag oven?
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.
How much does it cost to fix a Maytag oven 1d21 error code?
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.
Can 1d21 appear on a Maytag oven after a self-clean cycle?
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.

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