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How to Test ,Choose, Verify and Replace the Thermal Fuse?

Author: Apogeeweb
Date: 25 Mar 2022
thermal fuses



Ⅰ Essential Facts about the Thermal Fuse

Ⅱ How to Change a Maytag Thermal Fuse

Ⅲ Replacing a Thermal Fuse in a Maytag

Ⅳ How to Verify the Thermal Fuse Is Burned out on a Dryer

4.1 Symptoms

4.2 Locate the Fuse

4.3 Bypass Method

4.4 Multimeter Test

4.5 Troubleshooting

Ⅴ How to Test and Replace a Dryer Thermal Fuse

Step 1: Locate the Fuse

Step 2: Cut Power to the Dryer

Step 3: Disassemble as Needed

Step 4: Disconnect the Thermal Fuse

Step 5: Conduct a Continuity Test

Step 6: Purchase a Replacement

Step 7: Replace the Fuse

Step 8: Reassemble the Dryer and Test It

Ⅵ 3 Factors to Consider Buying A Whirlpool Dryer Thermal Fuse

6.1 Electrical shops

6.2 Hard wares

6.3 Whirlpool appliance stores

6.4 Physical stores

6.5 Online store

Ⅶ How to Reset a Thermal Fuse

Ⅷ Operation Principle of the Thermal Fuse

Ⅸ Application of the Thermal Fuse

Ⅹ General Considerations of the Thermal Fuse

10.1 Location

10.2 Calibration Temperature

10.3 Thermal Gradients

10.4 Temperature Limits


1. What’s the purpose of a thermal fuse?

2. Is a thermal fuse the same as electrical fuses?

3. What are thermal fuses used for?

4. How do you know if a thermal fuse is working?

5. How do you replace a thermal fuse?

6. Where do you find thermal fuses?

7. Where to Buy Thermal Fuse for Whirlpool Dryer?

8. What Is a Thermal Fuse for A Whirlpool Dryer?

Ⅻ Conclusion


A thermal fuse, also known as a thermal cutoff, is a safety device that opens circuits in the event of overheating. It detects heat created by an overcurrent caused by a short circuit or component failure. Thermal fuses, unlike circuit breakers, do not reset themselves when the temperature drops. When a thermal fuse breaks or is triggered, it must be replaced.

You will learn from the video: how to bypass thermal fuse electricfan (tagalog tutorial)

Thermal fuses, unlike electrical fuses or circuit breakers, only react to excessive temperature, not excessive current, unless the increased current causes the thermal fuse itself to heat up to the trigger temperature. Thermal Fuse will be covered in this article.


 Essential Facts about the Thermal Fuse

The thermal fuse is classified into several types. This is not a component that is one-size-fits-all. Thermal fuses are used in home appliances and in industrial applications to monitor heat through a sensor that is set at a specific level to turn off electrical flow when it reaches the preset threshold. It keeps track of machines and appliances to ensure their safe operation. Thermal fuses keep your clothes dryer from overheating and setting fire in your home. They prevent industrial machinery from overheating and catching fire. They are part of a safety system that frequently relies on human action, such as keeping lint out of clothes dryers and monitoring other devices for proper maintenance.

 How to Change a Maytag Thermal Fuse

Thermal fuses prevent a dryer from overheating in the tumbler if the thermostat fails. If the thermostat, which should shut off the system at 155 degrees Fahrenheit, is not working, the thermal fuse blows at 196 degrees Fahrenheit. When this happens, the thermal fuse must be replaced.

 Replacing a Thermal Fuse in a Maytag

The steps below will show you how to replace a thermal fuse in a maytag 

  1. Disconnect the drier from the wall outlet. Take it away from the wall. Remove the vent by unscrewing the screw that keeps it in place. Locate all of the screws that are keeping the rear panel in place. With the socket wrench, unscrew all of these screws.
  2. Find the thermal fuse, which is usually near the blower on the bottom of the drier. The blower is connected to the vent you removed. If it isn't here, it will be on the dryer's side panel. The thermal fuse is a white plastic strip with two wires attached to it.
  3. Remove the two wires from the thermal fuse. Pull-on the locking clip with needle-nose pliers. Make sure to pull the clips rather than the wires. They'll just snap right off.
  4. Unscrew the two screws on each side of the thermal fuse to remove it from the drier. To remove these screws, use a Phillips screwdriver. Take it out of the dryer.
  5. Install a new thermal fuse in place of the old one. To secure the thermal fuse, screw both screws into its sides. Reattach the wires to their original locations.
  6. Replace the functioning thermostat. This is near the heater element cover on the top-left panel. Using needle-nose pliers, remove the two wires from the thermostat. Pull the locking clips rather than the wires. Unscrew the screws on the thermostat's sides and pull it out. Install your new thermostat and tighten the two screws. Reconnect the thermostat's wires.
  7. Reattach the back panel to the drier. Replace all of the screws that were removed. Tighten the vent that was removed from the back of the drier.

 How to Verify the Thermal Fuse Is Burned out on a Dryer

A thermal fuse is a little device, about an inch or two long, that plays an important role in fire prevention. All dryers made since the 1980s are required by law to include a thermal fuse. If the temperature of the dryer exhaust becomes too high, a thermal fuse will trip. If this occurs, the fuse shuts down the dryer or its components. A thermal fuse can only be used once. The fuse must be replaced if it triggers during a high-exhaust temperature incident.

4.1 Symptoms

Many dryers will simply not turn on if a thermal fuse is tripped. Other types keep the drum spinning and the dryer running, but the heating element does not. When the dryer's drying cycle is over, the clothes come out wet. Manufacturers' consistency varies from model to model, even within the same brand.

4.2 Locate the Fuse

On the dryer's exhaust duct, thermal fuses are fitted. To access the fuse, you typically need to remove the back panel of a dryer. Before attempting to locate and troubleshoot the fuse, make sure to turn off the dryer's power. Most dryers hook into a 220-volt wall socket, therefore unplugging the appliance will turn off the power. Thermal fuse forms and sizes vary. Some are made of plastic, while others are constructed of metal. Look for a little gadget the size of a quarter to about 2 inches long that is positioned immediately on top of the exhaust duct. Two wires are linked to a thermal fuse.

4.3 Bypass Method

Temporarily bypassing the device is a reliable approach for determining whether a thermal fuse has burned out. However, it is tempting to use the dryer in this manner, or to forget to replace the fuse once the dryer is turned on. Bypassing the fuse is merely a quick way to see if the fuse is faulty. It is not a long-term solution. Disconnect the two wires from the fuse and connect them with a jumper wire before turning on the dryer. If it starts and warms up, the thermal fuse has blown and must be replaced.

4.4 Multimeter Test

A better, faster method of testing necessitates the use of an electrical multitester set to its lowest RX level. Remove the two wire leads from the thermal fuse and connect a multitester probe to each fuse wire terminal. If you receive an infinity reading, the fuse is fine. Any reading less than infinity indicates a tripped thermal fuse, which must be replaced.

4.5 Troubleshooting

Replace the fuse with a fuse that is a perfect match for your dryer's brand and model. Then examine the dryer to see why the fuse blew. Sometimes a fuse fails due to age, but other times something else fails, causing exhaust temperatures to climb. Before troubleshooting, make sure the power is still turned off, and then look for blockages in the exhaust duct that are limiting airflow. Check the fan blades on the blower motor for damage and make sure the motor isn't binding. You should also replace the dryer cycling thermostat and the thermal fuse. If this thermostat fails, the thermal fuse will most likely be triggered.

 How to Test and Replace a Dryer Thermal Fuse

Step 1: Locate the Fuse

The position of the thermal fuse should be found in the owner's manual. If you did not save the document that came with the dryer, the manual is usually available on the manufacturer's website.

Step 2: Cut Power to the Dryer

Remove the dryer's plug. Turn off the double-gang 30- or 40-amp, a 240-volt circuit breaker that regulates the dryer if it is linked to the wiring.

Step 3: Disassemble as Needed

You may be able to access the thermal fuse by unscrewing screws and removing a panel on the front or the back of the dryer. On some models, you can access the thermal fuse by pulling the dryer vent off the outlet on the back of the dryer. On some models, you may have to remove the top of the dryer and the front door and lift out the dryer drum.

Step 4: Disconnect the Thermal Fuse

Pull the wires from the fuse's terminals to totally detach it from the dryer circuitry.

Step 5: Conduct a Continuity Test

Set a multimeter's dial to measure resistance in ohms. Note the reading after touching one probe to one of the fuse terminals and the second probe to the other terminal. If the meter reads zero ohms, the fuse is fine and does not need to be replaced; however, if the reading is significant or infinite, a new fuse is required.

Step 6: Purchase a Replacement

Because the replacement fuse is model specific, you must obtain it from the manufacturer or a third-party provider. You'll need the dryer's make and model number, which may be found by reading the label on the control panel or inside the door.

Step 7: Replace the Fuse

One or two Phillips screws secure the fuse to the dryer chassis. Remove the screws and the fuse, then replace the fuse and tighten the screws. The electrical lines should then be reconnected.

Step 8: Reassemble the Dryer and Test It

Reverse the steps you took to disassemble the dryer, plug it in, and turn it on to ensure it works.

Ⅵ 3 Factors to Consider Buying A Whirlpool Dryer Thermal Fuse

Where can I get a thermal fuse for my whirlpool dryer? It is critical to purchase a thermal fuse for your Whirlpool dryer, and they are not difficult to get if you know where to look. We have listed the following locations where you might be able to locate your Whirlpool dryer's thermal fuse. All of these alternatives are available to you. Choose the one that is most relevant to your situation.

6.1 Electrical shops

The first option we have for you is to go to an electrical store. If we consider what a thermal fuse is, we can conclude that it is an electrical tool intended to prevent overheating, based on our previous research. Given this, it is preferable to look for one in an electrical store.

What's fantastic about this is that you may seek assistance if you don't know where to look. Of course, you should inquire as to whether thermal fuses for Whirlpool dryers are accessible. It is advisable to mention the brand so that you do not have trouble fitting it in. If you want to achieve high quality, go for branded and high-grade thermal fuses. However, if you're on a tight budget, you can settle for a well-known brand as long as it works and matches your Whirlpool dryer. In this manner, you can ensure that your machine does not overheat in the interim.

6.2 Hard wares

This second alternative may be easier to locate in your region. Hardware can be found everywhere. It can be found by the side of the road, in supermarkets, and even at large places such as shopping malls. This varies depending on where you are in your country, especially if you are distant from a city. When it comes to fixing things and finding equipment to utilize, hardware is the only area we can recommend. But, of course, that's not all. There are numerous things you might enjoy and have on it. Check to see if you can locate a thermal fuse for your Whirlpool dryer.

6.3 Whirlpool appliance stores

The final place you may look for this is at whirlpool appliance stores. And these can be divided into two categories. One is their actual store, and the other is Whirlpool's online shop, which you can readily accessible via the internet and other resources.

6.4 Physical stores

Whirlpool's actual storefronts are occasionally created on their own, where all products under the given brand are offered. Now, if you are unsure about what you should get, we recommend that you visit their physical store. Their personnel can assist you if and only if you are unsure about which thermal fuse would be appropriate for the model of your whirlpool dryer. However, their physical store would sell one. To avoid regrets, it is best to inspect the quality before making a purchase.

 6.5 Online store

We've got you covered if you don't have time to go shopping or walk about a lot, or if you have a lot of chores and jobs to accomplish. Don't worry, we're still here to help! We've created an online solution for you.

You might buy a whirlpool dryer thermal fuse in an instant from their internet site. You can type this into your social networking platforms' search box. Then you can read the reviews and comments about it. Less trouble, more options!

 How to Reset a Thermal Fuse

You're on the right track if you're wondering how to reset a thermal fuse because your clothes dryer overheated, but a thermal fuse, unlike a thermal switch, cannot be reset, so if one blows and the appliance stops heating or won't turn on at all, you'll have to replace it like an old-style electrical fuse. Thermal fuses are found in almost every piece of equipment that heats up, including your washer, microwave oven, regular electrical oven, dishwasher, and room heater. Your refrigerator has a thermal cutoff fuse because the compressor can overheat, while your central heating fan's blower is more likely to have a resettable thermal switch.

The thermal fuse is a safety feature that prevents fires by cutting electricity to the heating element or the entire appliance. If your electric dryer is unusually warm and won't switch on, the thermal fuse has most likely blown, and the dryer will not work even if the temperature reduces. Replacing a thermal fuse is simple and affordable, however getting to the fuse may be difficult, and depending on where the manufacturer placed it, it may take some disassembly. In many cases, though, you may access it by simply removing the appliance's front or rear panel.

 Operation Principle of the Thermal Fuse

Thermal fuses are circuit breakers in temperature sensing devices that detect overheating from a fire, a short circuit, or aberrant electronic performance and switch off the circuit. Thermal fuses are not re-usable once they've been used, although they do work in the specified temperature only once.

SW-1, 3, 5 series thermal fuses

sw-1, 3, 5-series-thermal-fuses

Thermal fuses in the SW-1, 3, and 5 series are made up of sliding contact, a spring, and an electrically non-conductive thermal pellet. Current passes from the left lead to the sliding contact and then to the right lead through the metal casing before it begins to operate. When the temperature reaches the appropriate working point, the thermal pellet transitions to a liquid state and the spring compression loosens. The sliding contact slides away from the left lead as the spring extends. The circuit is closed, and the current flowing between the sliding contact and the left lead is cut off.

SW-2 series thermal fuses


The SW-2 series thermal fuses are made up of axially symmetric leads, a metal compound thermal element that melts at a specific temperature, a unique compound that prevents the element from oxidizing, and a ceramic insulator. When the ambient temperature rises, the specific resin compound begins to liquefy, and when the temperature approaches the melting point of the thermal element, it causes surface tension. Following that, a metal compound that joined two leads melted, drawing back to the leads, and irreversibly destroying the circuit.

 Application of the Thermal Fuse

In a variety of conventional and custom designs, MICROTEMP® thermal cutoffs provide reliable one-shot over-temperature protection in a variety of applications. The technique of installation and the position of the thermal cutoff can have an impact on performance. Both the application and the installation are critical to the product's overall performance, and comprehensive testing is required for both AC and DC applications. The following recommendations will answer the majority of your inquiries about these two topics.


 General Considerations of the Thermal Fuse

10.1 Location

The proper and most ideal position for a thermal fuse must be determined with sufficient time and effort. Infrared thermography, or a sufficient number of thermocouples, should be considered for identifying the highest temperature locations in the application during normal operation and fault conditions. In general, the place with the greatest difference between these two circumstances is the most attractive.

10.2 Calibration Temperature

It is required to choose a thermal fuse rating that is higher than the highest temperature encountered by the thermal fuse during normal operation, taking into account projected short-term temperature overshoots. The thermal fuse's life expectancy is determined by the temperatures it encounters during regular operation. The chance of a nuisance trip increases if the thermal fuse rating is too close to the temperature experienced during regular operation (including overshoot temperature after opening a thermostat, for example). Nuisance tripping is induced by particle shrinkage as a result of repetitive operation at temperatures close to but below the calibration temperature, or by severe thermal gradients between the TCO and its leads (see thermal gradients). Based on product needs, the design engineer must choose between response and TCO life. It is vital to realize that actual application temperatures will vary from unit to unit.

10.3 Thermal Gradients  

Thermal fuse location that is ideal exposes the entire thermal fuse casing, leads, epoxy seal, and internal components to a consistent temperature environment.

To reduce heat gradients across the thermal fuse body, the thermal fuse should be placed with care. In some applications, the thermal fuse can be positioned in such a way that heat is transferred to the thermal fuse's body via one of the leads, resulting in temperature gradients across the thermal fuse. Thermal gradients can shorten the life of a thermal fuse over time if the isolated (epoxy) lead is regularly lower in temperature than the case lead. Long-term testing is advised to determine whether these conditions occur in the application. Attaching the isolated (epoxy) lead to the heat source rather than the case lead to reduce the impact of thermal gradients and the temperature increase of the TCO body caused by this heat flow. To facilitate gradient evaluations, thermocouple fuses can be supplied with thermocouples on both ends.

10.4 Temperature Limits

The temperatures encountered during regular operation, including projected temperature overshoots, will influence the thermal fuse's life expectancy. If the thermal fuse rating is too close to the temperatures experienced during regular operation, nuisance trips can occur. Thermal fuses, regardless of temperature rating, should not be exposed to continuous typical temperatures over 200°C. Furthermore, overshoot temperatures after the thermal fuse are opened should be kept to a minimum to avoid dielectric failure and thermal fuse conduction.


1. What’s the purpose of a thermal fuse?

A thermal fuse's purpose is typically to act as a cutoff for heat-producing equipment. Thermal fuses, as the name implies, are commonly found in heat-producing electrical equipment such as coffee makers and hair dryers. They serve as safety mechanisms, cutting off the current to the heating element in the event of a failure (such as a faulty thermostat), which would otherwise allow the temperature to rise to unsafe levels, potentially causing a fire.

2. Is a thermal fuse the same as electrical fuses?

Some of the functions of a thermal fuse are the same as those of traditional fuses, such as the safety factor, but they are not the same. When a thermal fuse is triggered, it interrupts or stops the current to prevent a circuit from overheating. This is similar to how a typical fuse works. The primary distinction between the two is that once the thermal fuse has been activated, it is no longer usable. A regular fuse will reset itself, however, a thermal fuse will not and must be replaced immediately. If a thermal switch fails, the same thing happens. It is not intended to self-reset like other fuse kinds. A second distinction is that a thermal fuse will only activate when there is an excess of heat rather than an excess of current. The overcurrent must be large enough to generate an excessive amount of heat that the thermal fuse can detect. The heat causes the thermal fuse to warm up, triggering a response that protects against electrical fires.

3. What are thermal fuses used for?

Thermal fuses are specialized fuse types that are most typically seen in equipment that generates or heat up. Hairdryers and garment dryers, both of which are commonly used in the home, are examples of common domestic equipment that utilizes thermal fuses. They are also utilized in the manufacture of coffee machines. When there is a malfunctioning thermostat or another form of malfunction, the thermal fuse disconnects the electricity to the heating element. The thermal fuse also protects the heating element from receiving too much current or from heating beyond its limits.

4. How do you know if a thermal fuse is working?

To test a thermal fuse, you should use a multimeter. Simply connect the right side of the device's lead to the fuse's right side. Repeat the procedure on the left multimeter lead as well. If the needle moves, this indicates that the fuse is still active. If the needle does not move, it is likely that the fuse has blown and must be replaced. If a thermal fuse blows, a variety of appliances will stop working. If there are no other defects or difficulties with the equipment, simply changing the thermal fuse may restore normal operation.

5. How do you replace a thermal fuse?

A blown fuse is not difficult to repair after testing a thermal fuse as advised, depending on the type of device. In most circumstances, the back panel of a clothing dryer must be removed. Typically, the fuse is located behind the back panel. It's always a good idea to check the owner's manual of any appliance for the precise location of the thermal fuse. It is sometimes found near the top of the dryer. If you don't have a printed manual, you should be able to get one online. Simply replace the old blown fuse with a comparable model.

6. Where do you find thermal fuses?

If you know where to search, thermal fuses are easy to find. They are available at the majority of hardware stores. They are also available in home improvement and appliance stores, as well as online. The average cost of a fuse is $10.

7. Where to Buy Thermal Fuse For Whirlpool Dryer?

Where can I get a thermal fuse for my Whirlpool dryer? If you're looking for a thermal fuse to utilize, it's not difficult to find. However, if you are seeking for a specific type and brand, such as Whirlpool, we can assist you in locating locations where you may get a thermal fuse. You should not be concerned if you are unfamiliar with what it is and how it works.

These thermal fuses for Whirlpool dryers are the same as other brands, except they are made specifically for the machine or model.

8. What Is A Thermal Fuse For A Whirlpool Dryer?

A thermal fuse is a tool that is often used in laundry services since it helps to prevent overheating of the dryer. The only difference between it and other thermal fuses is that it has a distinct brand that is well-known and well-liked all over the world. Here's how to disable an electric dryer's thermal fuse.


Thermal fuses are safety measures that help to keep a heat-generating appliance from overheating and catching fire. They vary from ordinary fuses in that they only stop current flows when there is a significant enough problem to cause overheating. When the fuse overheats, the sensors detect the heat and cut off the electricity. Once a thermal fuse has completed its function, it must be replaced promptly. It can prevent a fire or serious injury caused by overheating, but it will no longer function. These fuses are not like other types of fuses that may be reset. They are rendered ineffective once they have been triggered. They're necessary components in any equipment that creates heat, and they're excellent safety safeguards for preventing injury-causing incidents, but they also cause the appliance to stop working after they're blown. If an appliance overheats and subsequently stops working, you'll most likely need to replace the thermal fuse to get it working again.

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