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Error code reference

Maytag Range Error Code 1d12

Runaway temperature (650°F) detected with door unlocked in lower oven; door unlock sensor resistance > 2237…

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Runaway temperature (650°F) detected with door unlocked in lower oven; door unlock sensor resistance > 2237 ohms.

First step from the service manual

Check temperature sensor and wiring; control disables all outputs.

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 1d12 means on a Maytag range

Error code 1d12 indicates the Maytag range control board has detected a runaway temperature condition in the lower oven cavity, with the oven temperature reaching or exceeding 650°F while the door remains in the unlocked position. The control board monitors the lower oven temperature sensor (RTD probe) continuously during operation; when the cavity temperature climbs beyond the 650°F threshold without a self-clean cycle being active, the board flags this fault and shuts down the heating circuit to prevent damage. The two primary suspects are a failed oven temperature sensor sending an inaccurate signal and stuck or welded relay contacts on the control board that are allowing the bake or broil element to remain energized beyond the set temperature.

For homeowners, this code means your lower oven got dangerously hot and the control system caught it. This is not a normal operating condition. The oven may have been heating without stopping because either the temperature probe gave the board bad readings, or the internal switch (relay) that controls power to the heating element got stuck in the on position. Either way, the oven was not regulating heat correctly.

After disconnecting power to reset the fault, inspect the oven temperature sensor for physical damage, corrosion, or a loose connector. Measure the sensor resistance at room temperature; most Maytag RTD sensors read approximately 1,080 ohms at 75°F. Verify relay contacts on the control board are not fused closed.

Source: manufacturer service documentation.

Common causes of 1d12

  1. 01

    Stuck or welded relay contacts on control board

    Part replacement

    The relay responsible for cycling the bake or broil element can weld shut under high-current conditions, causing the element to stay energized continuously and drive oven temperature past 650°F. This is a frequent trigger for runaway temperature faults when the sensor itself reads accurately.

  2. 02

    Faulty lower oven temperature sensor (RTD probe)

    Part replacement

    A failing RTD sensor can report a falsely low temperature to the control board, causing the board to call for continuous heat in an attempt to reach the set point. The actual cavity temperature climbs unchecked until the 650°F threshold triggers the 1d12 fault.

  3. 03

    Damaged or shorted oven sensor wiring harness

    Part replacement

    Wiring between the lower oven temperature sensor and the control board can be damaged by heat, pinching, or rodents, causing resistance values that mimic a cold oven signal. The control board responds by commanding full heat output, which can push cavity temperature into runaway territory.

  4. 04

    Control board firmware or internal logic fault

    Part replacement

    In less common cases, the control board itself may misinterpret sensor data or fail to execute the cutoff command even when sensor and relay hardware are functioning correctly, resulting in a spurious or persistent 1d12 code after all other components test within spec.

See the test procedure for each cause

Frequently asked questions about 1d12

What does error code 1d12 mean on a Maytag range?
Error code 1d12 means the control board detected a runaway temperature condition in the lower oven cavity, specifically a temperature at or above 650°F with the oven door in the unlocked position. This is not a normal baking or broiling temperature, so the control board shut down the oven to prevent damage. The most likely causes are a stuck relay on the control board or a faulty lower oven temperature sensor providing bad data.
Is it safe to use my Maytag range with error code 1d12 active?
No, you should not use the lower oven while 1d12 is active. This code indicates the oven reached at least 650°F without being in a self-clean cycle, which means the temperature regulation system failed. Operating the oven again before diagnosing and resolving the fault risks damaging oven components, scorching food, or creating a fire hazard. The cooktop surface burners can still be used, but the lower oven should remain off until the sensor and relay contacts are verified.
How do I fix error code 1d12 on a Maytag range?
Start by disconnecting power to the range for at least five minutes to clear the fault and reset the control board. After restoring power, if 1d12 returns or the oven overheats again, pull the lower oven temperature sensor and measure its resistance with a multimeter; a reading far outside 1,080 ohms at room temperature confirms a bad sensor. If the sensor tests correctly, the relay contacts on the control board are the next component to inspect or replace. A failed relay that is welded closed requires replacing the control board.
How much does it cost to repair error code 1d12 on a Maytag range?
A replacement lower oven temperature sensor typically costs between $20 and $50 for the part and takes under 30 minutes to replace, making it a common DIY repair. A new control board with functioning relays generally runs $150 to $350 depending on the specific Maytag model. If you hire a technician, expect a service call fee of $75 to $120 plus parts and labor, bringing a control board repair to $300 or more in total. Diagnosing the sensor first is the right starting point since it is the less expensive fix.
Will disconnecting power fix 1d12 permanently on my Maytag oven?
Disconnecting power may clear the 1d12 code temporarily, but it does not fix the underlying problem. If the lower oven temperature sensor is drifting out of spec or the relay contacts on the control board are damaged, the runaway condition and the fault code will return during the next use. A power reset is the correct first step to confirm the fault is active and not a one-time glitch, but any recurrence of 1d12 means component-level diagnosis is required.

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