How to Test Dryer Thermal Fuse: Troubleshooting Steps and Tips

Testing a dryer thermal fuse involves using a multimeter to check its continuity and resistance. To do this, the dryer needs to be disconnected from the power source and its thermal fuse removed before testing.

Dryer thermal fuses are an essential safety feature that prevents overheating, which can cause fires. As a result, it’s important to know how to test the thermal fuse to determine if it’s faulty and needs replacement. The process involves using a multimeter to check for continuity and resistance. With proper testing, you can figure out if the thermal fuse is the root cause of an issue, such as a dryer that isn’t producing heat. However, before testing, it’s essential to disconnect the dryer from the power source and remove its thermal fuse for the test to be valid.

How to Test Dryer Thermal Fuse: Troubleshooting Steps and Tips


Understanding The Function Of A Dryer Thermal Fuse

When you turn your dryer on, the thermal fuse is responsible for preventing it from overheating and potentially causing serious damage or even a fire. Understanding what a dryer thermal fuse does and how to test it is critical for maintaining your dryer’s safety and longevity.

What Is A Dryer Thermal Fuse?

A dryer thermal fuse is a safety component that shuts off the dryer’s heating element if it gets too hot. This fuse is usually located on the dryer’s blower housing or exhaust duct, and it’s designed to activate if the dryer’s temperature exceeds a certain point.

Why Is A Dryer Thermal Fuse Important?

The thermal fuse is important because it prevents your dryer from overheating, which can cause serious damage to the machine, or even a fire hazard. If the dryer is unable to regulate its temperature, it can cause a safety hazard, and can potentially lead to significant damages.

Testing Your Dryer Thermal Fuse

To know for sure whether your dryer thermal fuse is functional or not in need of a replacement, you will have to use a multimeter to test it electrically.

  • First, unplug your dryer from the power source to avoid electrocution.
  • Locate the thermal fuse by checking the owner’s manual or looking behind the back panel of your dryer. Remove any screws or clips needed for accessing the thermal fuse.
  • Detach the wires from the thermal fuse using pliers. Don’t forget to label the wires so that you can reconnect them properly later.
  • Set the multimeter to “ohms” (also known as resistance) and touch the red and black probes together. Look at the number on the multimeter’s screen. This reading is the multimeter’s base reading and must be subtracted from the thermal fuse reading for accuracy.
  • Touch the probes to the thermal fuse’s terminals. The multimeter should read zero resistance meaning a connectivity pathway between the two probes was found.
  • Subtract the base reading from the thermal fuse reading. That number should indicate the thermal fuse’s resistance.
  • Compare the resistance reading with the manufacturer’s recommended resistance for your dryer.
  • If the resistance reading is different, it means that the thermal fuse must be replaced.
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In Summary

Testing your dryer thermal fuse is important to ensure that your dryer remains safe and functional. Understanding what a dryer thermal fuse does and why it’s important, as well as knowing how to test it, is crucial knowledge for any dryer owner.

Remember to always take visual safety precautions when handling electrical appliances. Properly following the steps outlined above, ensures the longevity and safety of your dryer.

Tools And Materials Required For Testing Dryer Thermal Fuse

Are you having issues with your dryer overheating or not turning on at all? The thermal fuse may be the culprit. Testing this small but vital component can save you the expense of calling in a repair person or even buying a new dryer.

To get started, you’ll need a few tools and materials. Let’s take a look at what you’ll need.


A multimeter is a tool used to measure electrical current, voltage, and resistance in circuits.

  • Set the multimeter to ‘continuity’ or ‘ohms’ mode.
  • Disconnect the dryer’s power supply and remove the thermal fuse.
  • Place one of the multimeter’s probes on each of the thermal fuse’s terminals.
  • If the multimeter shows a reading of zero or very low resistance, the fuse is good.
  • If the multimeter shows no reading, the fuse is blown and needs replacement.


A screwdriver is needed to remove the dryer’s back panel to access the thermal fuse.

  • Disconnect the dryer’s power supply.
  • Use a screwdriver to remove the screws securing the dryer’s back panel.
  • Remove the panel to access the thermal fuse and wiring connections.

Replacement Thermal Fuse

If the thermal fuse is found to be blown during testing, it must be replaced. It’s important to purchase the correct replacement fuse made for your dryer model.

  • Ensure the replacement thermal fuse has the same amperage and voltage ratings as the original one.
  • Follow the manufacturer’s instructions to install the replacement fuse properly.

By having these tools and materials ready for testing and replacing a dryer thermal fuse, you can save time and money and have your dryer working again in no time. Remember to follow safety precautions and to disconnect your dryer’s power supply before starting any repairs.

How To Test A Dryer Thermal Fuse For Continuity

Steps To Test A Dryer Thermal Fuse

Dryer thermal fuse is a small but important device that helps maintain the optimal temperature of your dryer. It is designed to regulate the temperature and prevents overheating, thereby safeguarding other components from potential damage. However, like any other electronic component, it is prone to wear and tear over time, and you may need to test it periodically to ensure that it is functioning correctly.

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In this article, we will guide you through the steps to test a dryer thermal fuse so that you can troubleshoot any issues and keep your dryer functioning efficiently for longer.

Step 1: Safety First!

Before testing the thermal fuse, it is essential to ensure your safety. Turn off the power supply to your dryer and unplug it from the electric socket.

Step 2: Locate The Dryer Thermal Fuse

The dryer thermal fuse is usually located on the blower housing or vent duct. Check your dryer’s manual or look for diagrams online to locate the thermal fuse in your specific dryer model.

Step 3: Remove The Thermal Fuse

Using a screwdriver, remove the screws to detach the fuse from the dryer. Gently pull out the fuse with your fingers or pliers and inspect it for any signs of damage or wear.

Step 4: Test The Thermal Fuse With A Multimeter

Set your multimeter to the ohms setting and attach the probes to the thermal fuse’s terminals. A functional thermal fuse should measure 0 ohms, indicating that there is continuity between the terminals. If the reading is infinity or ol, the thermal fuse is faulty and needs to be replaced.

Step 5: Replace The Thermal Fuse Or Seek Professional Help

If the thermal fuse is faulty, you can purchase a replacement and install it yourself by following the same steps as above. However, if you are unsure or uncomfortable with the process, it is best to seek professional help.

Step 6: Test The Dryer

Once you have replaced the thermal fuse, reconnect the dryer to the power supply and turn it on. Check if the dryer is working correctly or not. If the thermal fuse was the cause of the problem, the issue should be resolved, and the dryer should function normally.

Testing the dryer thermal fuse is a simple process that can be performed with a few basic tools. Regular maintenance and testing of the thermal fuse can prevent costly repairs and extend the lifespan of your dryer. By following these steps, you can ensure the optimal functioning of your dryer and enjoy clean, wrinkle-free clothes every time.

Interpreting Your Results

Testing a faulty dryer thermal fuse is incredibly important to ensure your machine is running safely. As we’ve discussed in our previous sections, a thermal fuse can cause your dryer to stop functioning entirely if it has blown. The process of testing these fuses is relatively simple and requires minimal equipment.

But interpreting your results is a critical step in repairing or replacing your fuse. Below, we will discuss some vital details for interpreting your results.

Understanding The Results Of Your Multimeter Test:

Suppose you have a multi-meter and have conducted a continuity test. In that case, you’ll be able to determine if your dryer thermal fuse is functioning correctly or has blown.

  • No reading of continuity indicates that your thermal fuse has blown, and you need to replace it.
  • A reading of continuity indicates that your thermal fuse is functioning correctly.
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Common Factors That Impact Your Test Results:

There are several factors that could impact the results of your test.

  • The accuracy of your multimeter and its calibration.
  • The positioning of your probe leads – incorrect placement of your probes could give inaccurate readings.
  • The temperature of your multi-meter may alter your results.
  • The voltage and current range on your multimeter should be correctly set to take an accurate reading.

Knowing When To Replace The Fuse:

Once you’ve determined that your thermal fuse has blown, you will need to replace it. However, it’s also important to investigate why the fuse had blown.

  • Obstruction in the exhaust vent.
  • Clogged dryer lint filter.
  • A faulty cycling thermostat.
  • Your dryer’s heating element needs replacing.

If you replace your thermal fuse without addressing the reason why it blew, then you may run into the same problem again. Consequently, you should investigate any underlying problems and promptly rectify them.

By following the steps outlined in previous sections and interpreting the results of your test, you’ll be better equipped to understand the functionality of your dryer thermal fuse. It’s essential to prioritize safety when working with any electrical device and to conduct these tests with the utmost care.

Replacing A Faulty Thermal Fuse

If your dryer is not producing any heat, there is a high chance that the thermal fuse is faulty. As discussed earlier, a thermal fuse is an electrical device that interrupts electrical flow when heated to a specific temperature. If the temperature inside the dryer gets too high, the thermal fuse will blow and need to be replaced.

Step 1: Unplug The Dryer

Before replacing the thermal fuse, ensure that the dryer is unplugged to prevent any electrical shocks.

Step 2: Locate The Thermal Fuse

The location of the thermal fuse varies by dryer model and brand. Check the manual for your dryer to locate it. However, most dryers have the thermal fuse on the back panel or on the blower housing.

Step 3: Remove The Thermal Fuse

Once you locate the thermal fuse, remove it by unplugging the wire connectors and unscrewing the screws. Be gentle and avoid damaging the wires or connectors.

Step 4: Install The New Thermal Fuse

Install the new thermal fuse by attaching the wire connectors and screwing it into place. Ensure that the wires are attached firmly and correctly.

Step 5: Test The Dryer

After replacing the thermal fuse, plug in the dryer and turn it on to test if it produces heat. If the dryer still does not produce heat, the problem may lie in another component. Call a professional technician to diagnose and fix the problem.

By following these simple steps, you can replace a faulty thermal fuse and save yourself the cost of hiring a technician. Remember to always unplug the dryer before attempting any repairs and to be careful not to damage any wires or connectors.


Testing your dryer thermal fuse is an essential task that should not be taken for granted. It is crucial to ensure that your dryer’s thermal fuse is in good working condition as it plays a significant role in protecting your dryer and your home from potential hazards.

From checking the continuity of the fuse to determining its resistance and using a multimeter, there are different ways to test your dryer thermal fuse. Remember that safety precautions must always be observed when performing any tests on your dryer appliance.

By following these simple steps, you can easily diagnose and troubleshoot any potential issues with your dryer thermal fuse and restore your appliance to its optimum performance. We hope this guide has been informative and helpful in assisting you in testing your dryer thermal fuse.