Dryer Thermistor Troubleshooting (Troubleshooting Guide)

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Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

If your dryer isn't heating, the thermistor might be faulty. First, ensure the dryer is unplugged. Use a multimeter to test the thermistor for continuity. If it's not functioning, replace it with a new one. Always follow safety guidelines when working with electrical components.

Confirm the symptom

Dryer won't heat up
Dryer takes too long to dry clothes
Dryer stops mid-cycle
Dryer displays error code related to heating
Dryer makes unusual noises during operation

Tools and prep

Multimeter
Screwdriver (Philips or flathead, depending on your model)
Replacement thermistor (if needed)
Work gloves
Safety glasses
Unplug the dryer from the power source
Allow the dryer to cool down completely
Consult your dryer's manual for specific instructions

Step-by-step troubleshooting

Access the Thermistor
Do: Unplug the dryer and remove the back panel using a screwdriver.
Observe: Locate the thermistor, usually near the heating element or exhaust duct.
Means: You should see a small, cylindrical component with wires attached.
Next: Proceed to test the thermistor.
Test the Thermistor
Do: Set your multimeter to the ohms setting.
Observe: Touch the multimeter probes to the thermistor's terminals.
Means: A functioning thermistor should show a resistance between 10,000 and 100,000 ohms at room temperature.
Next: Check the resistance reading.
Check Resistance Reading
Do: Compare the resistance reading to the expected range.
Observe: If the reading is outside the expected range, the thermistor is faulty.
Means: A faulty thermistor needs to be replaced.
Next: Replace the thermistor if necessary.
Replace the Thermistor
Do: Disconnect the wires from the old thermistor.
Observe: Remove the old thermistor and install the new one in the same position.
Means: Ensure the new thermistor is securely in place.
Next: Reconnect the wires to the new thermistor.
Reassemble the Dryer
Do: Replace the back panel and secure it with screws.
Observe: Ensure all panels are properly aligned and secured.
Means: The dryer should be ready for testing.
Next: Plug in the dryer and test it.
Test the Dryer
Do: Run a test cycle with a small load of clothes.
Observe: Monitor the dryer for proper heating and operation.
Means: If the dryer heats up correctly, the issue is resolved.
Next: If the problem persists, consult a professional.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Faulty Thermistor The thermistor regulates the heating element. If it fails, the dryer won't heat properly.	Common	Easy–Medium	Thermistor
Blown Thermal Fuse The thermal fuse cuts off power to the heating element if it overheats. If blown, it needs replacement.	Sometimes	Easy–Medium	Thermal Fuse
Defective Heating Element The heating element generates heat. If it fails, the dryer won't heat up.	Sometimes	Medium	Heating Element
Wiring Issues Loose or damaged wires can disrupt the power supply to the heating element.	Rare	Hard	Wiring Repair Kit
Control Board Malfunction The control board manages the dryer's functions. A malfunction can affect heating.	Rare	Hard	Control Board
Ventilation Problems Blocked vents can cause overheating, triggering the thermal fuse.	Common	Easy	None

Parts matching

The thermistor is a critical component in your dryer's heating system. Ensure you get the correct replacement part for your specific dryer model.

Thermistor (specific to your dryer model)
Thermal Fuse
Heating Element
Control Board
Wiring Repair Kit

Always check the dryer's model number and consult the manual for the exact part numbers.

When to call a professional

If the dryer still doesn't heat after replacing the thermistor
If you're not comfortable working with electrical components
If the dryer displays complex error codes
If there are signs of significant electrical damage
If the dryer is under warranty
If you encounter any safety hazards during the repair

FAQ

How do I know if my thermistor is bad?

Use a multimeter to test the thermistor for continuity. If it doesn't show the expected resistance, it's likely faulty.

Can I replace the thermistor myself?

Yes, replacing the thermistor is a relatively simple task if you follow safety guidelines and have the right tools.

What if my dryer still doesn't heat after replacing the thermistor?

Check other components like the thermal fuse, heating element, and control board. If you're unsure, consult a professional.