How To Test Dryer Thermistor With Multimeter? | [Updated]

Testing your dryer's thermistor is a crucial step in diagnosing and resolving temperature-related issues in your appliance. By regulating the dryer's temperature, the thermistor ensures that your clothes are dried efficiently and safely. Here's how to test how to test dryer thermistor, helping you maintain and troubleshoot it. 

Short Guide

"A thermistor is usually located inside the dryer's blower housing or exhaust duct. Switch the multimeter to the resistance or ohms (Ω) setting. Disconnect the thermistor's wires. Connect the multimeter probes to the thermistor's terminals. Neither probe has polarity, so it can be connected to either terminal. According to the temperature, a thermistor should show a specific resistance."

What does thermistor do on dryer?

In a dryer, a thermistor monitors and controls the temperature inside the appliance. By sending temperature-related signals to the dryer's control board, it regulates the drying process. Keeping this information in mind will ensure that your clothes dry safely and efficiently without damage. A thermistor keeps your dryer running at the right temperature so it can dry effectively and safely.

Tools and Equipment Needed

To test your dryer thermistor effectively, you'll need a few essential tools and equipment. What you'll need is listed below:

How to Test Dryer Thermistor| Step by Step guide

Here's how to test the thermistor in your dryer. Follow these simple instructions to determine the thermometer's functionality.

Step#1 Access the thermistor

How To Test Dryer Thermistor

On your dryer, locate the thermistor according to its model. This is usually found near the heating element or blower housing.

Step#2 Disconnect the wires

How to disconnect wires connected to thermistor

Gently remove the wires connected to the thermistor. Keep a note of their positions so you can reconnect them correctly later.

Step#3 Set your multimeter

how to set multimeter on resistances mode

Make sure your multimeter is set to resistance measurement (Ω). The resistance of most thermistors at room temperature (77°F or 25°C) is around 10,000 ohms.

If  you don't have multimeter then worried not Check Best Multimeter For Home

Step#4 Measure the resistance

Touch one multimeter probe (usually the red one) to one of the thermistor's terminals. Hold the probe against the terminal to ensure a firm connection. Connect the other multimeter probe (usually the black one) to the remaining terminal of the thermistor.

How To Test Dryer Thermistor

Resistance values should be displayed on multimeters. The reading should be compared with the expected resistance value. If your thermistor's resistance falls between 9,000 and 11,000 ohms, it is likely to be functioning properly.

Step#5 Interpreting the resistance reading

How To Test Dryer Thermistor

There is a problem with the thermistor when the measured resistance is significantly lower or higher than expected.

Step#6 Repeat the test (optional)

Adding accuracy to the test is possible by repeating it. If the readings consistently differ from the expected value, the thermistor is defective.


Troubleshooting Test Results

Having tested your dryer's thermistor and interpreted the resistance readings, it's time to troubleshoot and take appropriate action:

Thermistor tests within normal limits

You may not need to replace your thermistor if the resistance reading falls within the expected range (typically between 9,000 and 11,000 ohms at room temperature). In this case, you should investigate other possible problems, such as faulty heating elements, thermostats, or clogged vents. .

Thermistor tests outside normal limits

Whenever the resistance reading is significantly higher or lower than expected, it indicates a faulty thermistor. Replace the thermistor in such cases. 


Symptoms of a Faulty Thermistor

It is essential to identify the signs of a malfunctioning thermistor before testing. You must need to know symptoms of faulty thermistor after knowing how to test dryer thermistor because it will help you in determining the fault. Your dryer's thermistor may malfunction if it exhibits the following symptoms:

Inconsistent heating: If the temperature of your dryer differs during a cycle, it may be because of the thermistor.

How To Test Dryer Thermistor

Clothes not drying properly: When your dryer isn't getting hot enough, your clothes may come out damp or take longer to dry.

Overheating issues: On the other hand, if your dryer overheats and scorches your clothes, the thermistor may be malfunctioning.

Shortened dryer lifespan: Defective thermistors can increase the dryer's workload, causing it to wear more quickly.

Symptoms of a Faulty Thermistor

Replacing a Faulty Thermistor

In the event that your dryer's thermistor is indeed faulty, it's time to replace it. The following steps will show you how to do it:

Tools and materials needed for replacement

Gather the necessary tools and materials before you begin. A screwdriver, pliers, and a replacement thermistor compatible with your dryer model are typically needed. Make sure the replacement part matches the specifications of your old thermistor.

“Step-by-step”

Step#1 Access the old thermistor

Locate the faulty thermistor as you did during testing. Accessing it might require removing some panels or parts.

Step#2 Remove the old thermistor

How To Test Dryer Thermistor

Disconnect any wires connected to the old thermistor. Remove the screws or clips securing it in place with a screwdriver.

Step#3 Install the new thermistor

Attach the new thermistor where the old one was removed. Screws or clips should be used to secure it.

Step#4 Reconnect the wires

Connect the wires to the new thermistor, ensuring they are connected to the correct terminals.

Step#5 Reassemble the dryer

 Reattach any panels or parts that have been removed from the dryer. Reattach parts in the same way as you remove.

Step#6 Plug in the dryer

Plug the dryer back into the power source once the new thermistor has been installed.

Step#7 Testing the dryer after replacement

You should test your dryer again before declaring victory. Confirm that the new thermistor has resolved the issue by monitoring the dryer's temperature and drying performance. Check your installation again and consider seeking professional assistance for further diagnosis and repair if problems persist.

Read more about How to Test Dryer Outlet with Multimeter


Common Mistakes to Avoid

It's easy to make errors when testing or replacing a dryer thermistor, which can lead to inaccurate results. Avoid these common mistakes:

Rushing the testing process: Rushing through the testing procedure is one of the most significant errors. Ensure accurate results by following each step carefully. It is possible to make an incorrect diagnosis and misinterpret results from hasty testing.

Neglecting safety precautions: A priority should always be given to safety. Accidents and injuries can occur if the dryer is not unplugged or safety gear is not worn, such as gloves and safety glasses. Take these precautions seriously.

Incorrectly identifying the thermistor: Make sure you're testing the right component. In the case of thermistor misidentification, unnecessary replacements and expenses can result.

Skipping the replacement if needed: Whenever your thermistor tests outside the normal resistance range, don't ignore the problem. In order to prevent further dryer problems and potential safety hazards, it is crucial to replace a faulty thermistor.

Not seeking professional help when needed: There are times when dryer problems are more complex than a faulty thermistor. Consult a technician if you are uncertain about your diagnosis or encounter difficulties during testing or replacement. Repairing complex problems without the necessary expertise can worsen the situation.


Maintenance and Care Tips

Maintaining your dryer properly can extend its lifespan and prevent issues like thermistor failure. Keep your dryer running smoothly with these maintenance and care tips:

Tip#1 Recommendations for prolonging the life

In order to keep your thermistor in good working condition, keep the dryer environment clean and free of lint and debris. Lint filters and exhaust ducts of dryers should be cleaned regularly to prevent clogging. By doing this, you reduce the strain on the dryer's components, including the thermistor.

Tip#2 Regular maintenance

In addition to maintaining your thermistor, you should also maintain your entire dryer. Regularly check the heating element, thermostats, and other crucial components. To prevent further damage, address any issues as soon as you notice them. To detect and fix potential problems early, schedule professional dryer maintenance annually.

Tip#3 Avoid overloading the dryer

Overloading your dryer can cause the thermistor and other components to be strained. Ensure your dryer operates efficiently and doesn't experience unnecessary wear and tear by following the manufacturer's recommended load capacity.

Tip#4 Use your dryer with care

You should be careful what you put in your dryer. Rubber-backed rugs and items with flammable materials should be avoided because they can cause excessive lint or damage. By using your dryer thoughtfully, you can prevent thermistor and other component failures.


Safety Precautions

Whenever you work with appliances, safety should be your top priority. It is possible to prevent accidents and ensure a smooth testing process by taking the right precautions.

Importance of safety when working with appliances

To ensure your safety, unplug your dryer before testing begins. Electric appliances can cause shocks or even more serious injuries if they are powered. Disconnect your dryer's power source before performing any maintenance or testing. Keep your workspace well-lit and clutter-free to avoid accidents.

Safety gear and precautions to take

Protect yourself during the testing process by wearing safety gear such as gloves and safety glasses. Take these simple precautions to avoid burns or injuries. To prevent the dryer from toppling, place it on a stable surface during testing.


Conclusion

You can save time, money, and hassle by knowing how to test how to test dryer thermistor Following the step-by-step guide which I provided, you can diagnose thermistor issues, replace faulty components, and keep your dryer running smoothly. Safety should always take priority, and if you encounter difficulties or are unsure, seek professional assistance. You can make laundry day a breeze by taking proper care of your dryer and paying attention to its operation.


FAQs about how to test dryer thermistor

What is the maximum temperature for a thermistor?

Many standard thermistors are designed to operate reliably up to around 250°C (482°F) depending on their type and specifications. High-temperature thermistors can withstand even higher temperatures, often up to 300°C (572°F) or more, making them ideal for certain industrial applications. Temperature limits can differ between different thermistor models, so it's important to check the datasheet or specifications of each manufacturer. Thermistor damage can occur if the recommended maximum temperature is exceeded.

Can you clean a thermistor?

Cleaning a thermistor is possible, but you have to be gentle. Disconnect it from any power source first. Wipe the thermistor's surface gently with a soft, lint-free cloth or cotton swab dipped in isopropyl alcohol. To prevent damage, avoid using abrasive materials or excessive force. Make sure it has dried completely before reconnecting it. You can clean it to remove dust and contaminants that might affect its accuracy or performance.