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How Dryer Thermisters Work - Appliance Tip of the Week

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  • How Dryer Thermisters Work - Appliance Tip of the Week

    Appliance Tip of the Week...

    How Dryer Thermisters Work


    Thermistor Example Pics:





    A dryer thermistor is a temperature-sensitive resistor that measures the temperature in a clothes dryer.

    It works by signaling the dryer to make more or less heat based on how hot the air inside the drum is.

    The thermistor regulates the drum's air temperature by monitoring its resistance changes.

    When the air temperature reaches a certain level required to dry clothes, the control panel shuts off the heater.

    The thermistor is an important component of dryer circuitry and is used to determine when to cut power to the heating element.


    A dryer thermistor is a temperature-sensitive resistor that plays a crucial role in regulating the temperature inside the dryer drum. Here's how it works:
    1. Location: Dryer thermistors are positioned in the airflow conduit that carries heated air into the dryer's cavity, where clothes and other materials are being dried. They're wired to a central control board that synchronizes the dryer's operations
    2. Temperature Sensitivity: Thermistors change their electrical resistance based on temperature. As the local temperature rises, most thermistors become increasingly conductive. The dryer's circuit board responds to the voltage conducted by the thermistor, which reflects its current resistance level
    3. Function: The control board uses data from the thermistor to determine when to cut power to the heating element. By monitoring the air temperature inside the drum, the thermistor helps prevent overheating and ensures efficient drying
    4. Advantages: Thermistors are highly sensitive and can detect even slight temperature fluctuations. However, their sensitivity can also be a drawback, as they can be damaged if exposed to extreme temperatures



    Pro Tip: Each dryer model may have a specific type of thermistor, so replacements should match the original part.

    What could happen if a dryer thermistor is faulty?

    A faulty dryer thermistor can lead to several issues. Here are some potential consequences:
    1. Overheating: If the thermistor fails, the dryer may overheat. The thermistor measures the air temperature inside the dryer. When it malfunctions, the heating cycle may not shut off properly, causing excessive heat
    2. Loss of Temperature Control: A bad thermistor can result in a lack of temperature control. The dryer may keep the heat on for too long, leading to excessive temperatures
    3. Heating Problems: A faulty thermistor can cause the dryer not to heat up at all. If the thermistor is defective, it won't regulate the temperature effectively

    To diagnose and address these issues, consider checking the thermistor's continuity using a multimeter. If it's faulty, replacing it should resolve the problem.

    Always ensure the dryer is disconnected from power before performing any tests or repairs.


    To check the dryer thermistor, you need to...
    1. Access the thermistor on your dryer according to its make/model#
    2. Disconnect the wires connected to the thermistor
    3. Set your multimeter to resistance measurement (Ω)
    4. Measure the resistance by touching the multimeter probes to the two terminals of the thermistor
    5. Interpret the resistance reading

    Consult the tech sheet that came with your dryer for information about thermistor testing and, if the thermistor is the problem, replace it with a manufacturer-approved dryer part.


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    Related Links
    1. Dryer Fuse or Sensor Parts
    2. Dryer Heating Element Parts
    3. Dryer Control Board Parts
    4. Dryer Axle, Roller, Pulley Parts
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