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Error code reference

Maytag Dryer Error Code 12

Upper Dryer Thermistor Open Sensed

Maytag codesMaytag dryer codes

Upper Dryer Thermistor Open Sensed — temperature is low with an expected increase and no increase occurring after 3 minutes.

First step from the service manual

Check for low ambient temperature in room (below 50°F/10°C) and check door vent seals.

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

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What 12 means on a Maytag dryer

Error code 12 on a Maytag dryer indicates that the upper dryer thermistor has been sensed as open, meaning the control board detected a temperature reading that was lower than expected and saw no increase over a 3-minute monitoring window. The thermistor is a temperature-sensing resistor whose resistance changes predictably as temperature rises. When the dryer is running normally, the thermistor resistance drops as heat builds in the drum exhaust path. If the control sees a stalled, low-temperature reading with no upward trend after 3 minutes, it flags this condition as a thermistor open fault.

The most common root cause is an actual failure of the thermistor itself, either a broken internal element or a severed wire connection that causes the circuit to read as open. However, before condemning the thermistor, the diagnostic procedure correctly starts with environmental and airflow factors. A room temperature below 50 degrees Fahrenheit (10 degrees Celsius) can slow the expected temperature rise enough to trigger the fault on an otherwise functional dryer. Similarly, compromised door vent seals allow cold ambient air to infiltrate the drum, artificially suppressing the thermistor reading and preventing the expected temperature climb.

Additional causes include blocked or restricted exhaust venting, which traps cool air and limits heat buildup, and wiring harness faults such as loose connectors or chafed wires between the thermistor and the control board. A failed heating element or gas igniter can also cause this code by producing no heat at all, leaving the thermistor reading at ambient temperature indefinitely. Systematic diagnosis should proceed from ambient conditions and airflow checks through wiring inspection and component resistance testing before replacing the thermistor or control board.

Source: manufacturer service documentation.

Common causes of 12

  1. 01

    Failed Upper Thermistor

    Part replacement

    The thermistor itself may have an open internal circuit, causing it to send no usable signal to the control board. Testing the thermistor with a multimeter for continuity and proper resistance at room temperature will confirm whether it has failed.

  2. 02

    Cold Ambient Room Temperature

    Wiring / connection

    If the laundry area is below 50 degrees Fahrenheit (10 degrees Celsius), the dryer may not be able to raise the drum temperature fast enough to satisfy the 3-minute threshold. Moving the dryer to a warmer space or warming the room before running a cycle can rule this out.

  3. 03

    Damaged or Missing Door Vent Seals

    Part replacement

    Worn, torn, or improperly seated door seals allow cold outside air to enter the drum during operation, suppressing the temperature rise the thermistor monitors. Inspect the door gasket and vent seals visually and replace them if gaps or damage are found.

  4. 04

    Restricted or Blocked Exhaust Venting

    Wiring / connection

    A clogged lint trap, kinked duct, or blocked exterior vent hood reduces airflow and can prevent heat from circulating properly past the thermistor. Check the entire exhaust path from the dryer to the outside termination point for obstructions.

  5. 05

    No-Heat Condition from Heating Element or Igniter Failure

    Part replacement

    If the heating element on an electric dryer or the igniter and gas valve on a gas dryer has failed, no heat is produced at all, and the thermistor will never register a rise in temperature. Confirm whether the dryer is producing any heat during a cycle before isolating the thermistor as the sole cause.

See the test procedure for each cause

Frequently asked questions about 12

What does 12 mean on a Maytag dryer?
Error code 12 on a Maytag dryer means the upper dryer thermistor has been detected as open. Specifically, the control board monitored the temperature at startup and found it too low, with no increase occurring over a 3-minute period. This can point to a faulty thermistor, a heating system failure, cold ambient conditions, or air leaks around the door seals.
Can I fix error code 12 on my Maytag dryer myself?
Some causes of error code 12 are straightforward to address without professional help, such as cleaning a blocked exhaust duct, improving the room temperature, or inspecting door seals for gaps. If the thermistor itself has failed, replacing it is a moderately simple repair for someone comfortable working with appliances, as it typically involves disconnecting a wiring connector and removing a mounting screw. Heating element or gas component failures may require more advanced skills and should be approached carefully.
Is it safe to keep using my Maytag dryer when error code 12 is showing?
You should not continue running the dryer while error code 12 is active. The fault indicates the dryer is not heating properly or the temperature is not being monitored correctly, and operating it in this state could result in clothes not drying, repeated faults, or undetected overheating if the sensor circuit has a partial failure. Diagnose and resolve the underlying cause before resuming normal use.
How much does it cost to repair error code 12 on a Maytag dryer?
Repair costs vary depending on the root cause. If the issue is simply a blocked vent or cold ambient temperature, there may be no parts cost at all. A replacement thermistor typically costs between $15 and $50 in parts, and a door seal replacement runs roughly $20 to $60. If a heating element or gas valve component has failed, parts and labor combined can range from $100 to $300 or more depending on your location and the specific parts needed.
Will resetting my Maytag dryer clear error code 12?
Resetting the dryer by unplugging it or cycling the power may temporarily clear the error code display, but the code will return if the underlying problem has not been fixed. Since code 12 is triggered by an active condition the control board monitors during the cycle, the fault will reappear as soon as the dryer attempts to run and detects the same low-temperature situation. A reset is useful for clearing the code after you have completed a repair, not as a substitute for diagnosis.

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