How to test a thermal fuse from a dryer full
Last Updated: October 26, References. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. There are 13 references cited in this article, which can be found at the bottom of the page. This article has been viewed 5, times. Learn more As convenient as dryers are, it can be a pain when they suddenly stop doing their job.
If you have an electric dryer, use a multimeter to examine the heating coils and thermostat. If you have a gas dryer, you can use the same tool, but instead check the igniter, thermal fuse, and radiant sensor.
Explore this Article methods. Tips and Warnings. Related Articles. Method 1 of All rights reserved. This image may not be used by other entities without the express written consent of wikiHow, Inc.In some ways, that problem may seem easier to diagnose.
However, these symptoms are actually quite beneficial as they can help you more quickly pinpoint the problem rather than just having to guess why the whole appliance stopped working. If your dryer drum is spinning, it means the appliance is still receiving power and the motor that turns the drum is still running.
If the issue is that it is not producing any heat to efficiently dry your clothes, then this narrows down your investigation to the parts of the appliance responsible for producing, managing, and distributing that heat. If your dryer is tumbling but no longer producing heat, your first suspect should be the thermal fuse.
The thermal fuse is installed in dryers as a safety device. If the temperature gets too high in the dryer, the thermal fuse will trip in an effort to prevent a fire. Once this happens, the dryer will still function very much as normal, but the tripped fuse prevents the heating elements from receiving any power, so it will produce no heat. On newer models, a thermal fuse can completely shut the dryer down.
A thermal fuse is, in most cases, a part with a one time use. In order to turn the heat back on, you will need to replace the fuse located near the exhaust vent on your dryer. Some models may have a way of resetting the fuse, but more commonly it is something that needs to be changed out before your dryer will function normally again.
It is crucial that, while a fuse is quick to be replaced, you need to remember it was tripped for a reason. Failure to investigate and address why the thermal fuse was tripped is not only likely to result in more blown thermal fuses but means your dryer will remain a potential fire hazard.
If your thermal fuse was responsible for the issue, your first course of action after replacing it should be to check your dryer vent. The flexible metal hose that attaches your dryer to the vent in your home can become blocked with a buildup of lint.
As this blocks the proper release of hot, wet air from your dryer drum, it can cause the dryer to heat up. If the hose is blocked up, even partially, this is likely what caused the thermal fuse to blow. It will need to be cleaned out and you should monitor your dryer just in case this was not the sole cause, but a contributing one. You will also want to see if the clog goes beyond the flexible tubing.
If there is a lint clog in the actual ventilation system of your home, depending on how deep it is, you may need a professional with the proper tools to come out and remove it. Almost all the horror stories of dryer fires are caused by lint blockages in the ventilation, so it is important to never ignore this issue and fix it quickly before further use.If your Kenmore dryer runs but does not heat, the problem may be a blown thermal fuse in the heating-element circuit.
The thermal fuse is designed to open if the high-limit thermostat fails to open the heater circuit when the drum temperature reaches unsafe temperatures. Some Kenmore dryers -- those with solid state controllers -- will also have a small fuse on the printed circuit board to protect the solid state components against current surges and short circuits.
If the machine does not run at all, the problem may be a blown control fuse. Both the thermal fuse and control fuses are easy to check. When troubleshooting any appliance, always begin by disconnecting the appliance from its power source. In the case of a clothes dryer, move it away from the wall and disconnect its power whip or cord from the dryer receptacle. To access the thermal fuse, disconnect the exhaust duct from the dryer's outlet and remove the rear panel.
Here Is Why Dryer Keeps Blowing Thermal Fuse
The thermal fuse is a rectangular component near the heating element with wiring terminals on each end. To test any fuse, set the function switch on your digital multimeter to the "R X 1" scale or to its continuity function, if it has one. To test the thermal fuse, remove the wire or wires from one end of the fuse, then touch one of the meter probes to each of the terminals. Testing the small, glass-bodied fuse protecting the solid state components on the controller's circuit board is easy once you have gained access to the board.
Depending on the make of Kenmore dryer, you may have to remove from two to 12 screws from the control panel to gain access to the board. The controller fuse clips into a fuse holder on the board, so pull the fuse from its clips.
Alternatively, some fuses may be soldered into place, in which case it's necessary to unsolder one of the fuse ends before testing the fuse to prevent a false reading through other board components. When replacing fuses, ensure to replace them with an exact replacement.
In the case of a thermal fuse, replace the defective fuse with one of the same temperature rating. When replacing a thermal fuse, also replace the high-limit thermostat because odds are that the high-limit thermostat failed to open and caused the thermal fuse to blow.
When replacing a control board fuse, replace it with one of the same amperage rating. Based in Colorado Springs, Colo. Walch spent 40 years working in the electrical trades and holds an Associate of Applied Science in applied electrical engineering technology from Alvin Junior College. By Jerry Walch. Accessing the Thermal Fuse When troubleshooting any appliance, always begin by disconnecting the appliance from its power source.
Testing the Thermal Fuse To test any fuse, set the function switch on your digital multimeter to the "R X 1" scale or to its continuity function, if it has one. Testing Control Board Fuses Testing the small, glass-bodied fuse protecting the solid state components on the controller's circuit board is easy once you have gained access to the board.
Replacing Fuses When replacing fuses, ensure to replace them with an exact replacement. Photo Credits. About the Author.One of the most common problems that homeowners face with their electric dryers is when they have a dryer not heating up. There are several possible reasons associated with failure of different components that can make the dryer to stop heating. In order to troubleshoot effectively when an electric dryer is not heating, all the different components will need to be tested.
Any of the following components can be the cause of the problem and should be included in the troubleshooting procedure:. The heating element requires volts while the motor will start running even with as low as volts.
You can then turn the knob to put the dryer on a timed dry for high heat cycle to see if it will heat up. You will need a multimeter to test all the control circuit components at once. Make sure to disconnect your dryer from the power source for safety while checking for continuity. Then take your multimeter and set it to read ohms for measuring resistance. Your multimeter should read about 15 ohms of resistance if there is continuity for the heating element, high-limit thermostat, operating thermostat and thermal cut-off fuse.
If you detect no continuity for the control circuit, you will next need to check for the continuity of each component one at a time. Start by placing your multimeter leads on the terminals of the heating element. If there is continuity, your multimeter should also read about 15 ohms.Thermal Fuse (How it's Made)
That would indicate no problem with the heating element, so next you will need to do the same test for the high-limit thermostat.
Place your multimeter leads one for each of the terminals of the high-limit thermostat and you should read near zero ohms if there is continuity. In case there is no continuity, then it would mean that the high-limit thermostat is bad and would require replacement. If no problem, next check the operating thermostat. Place one lead of the multimeter on one of the wire terminals and the other lead on the remaining wire terminal.
You should also measure near zero ohms if there is continuity, but if no continuity then the operating thermostat would need to be replaced. If that goes well, next check continuity for the thermal cut off fuse. If everything is good so far, the last thing to check will be the timer.
Make sure your dryer is still disconnected and turn the timer to time dry, dry heat. If no continuity you have to replace the bad timer. But if everything is still good so far, the dryer could be failing to heat for other reasons like faulty motor centrifugal switch, plug or circuit breaker.
To fix that you might need to call a professional appliance repair service near you. Contents hide.A thermal fuse is a small device - just an inch or two long - that plays a critical role in preventing fires. Federal law mandates the inclusion of a thermal fuse on all dryers manufactured since the s.
A thermal fuse operates if dryer exhaust temperatures climb too high. The fuse shuts off the dryer or its components if this happens. A thermal fuse only works one time. If it triggers during a high-exhaust temperature event, the fuse must be replaced.
Many dryers simply will not run once a thermal fuse triggers. On other models, the drum continues to turn and the dryer operates, but the heating element does not. Clothes come out of the dryer wet once the appliance completes its drying cycle. Manufacturers are not consistent from model to model, even within the same brand. Typically, you must remove the back panel of a dryer to access the fuse.
Ensure to shut off electrical power to the dryer before attempting to locate and troubleshoot the fuse. Most dryers plug into a volt wall outlet, so you can unplug the unit to cut off power. Thermal fuse shapes and sizes vary. Some are made from plastic; others are metal. Look for a small device about the size of a quarter to about 2 inches long, mounted directly on top of the exhaust duct.
A thermal fuse has two wires connected to it.
A reliable method for testing whether a thermal fuse has burned out is to temporarily bypass the device. However, it is tempting to operate the dryer this way, or forget to replace the fuse once the dryer is running. Bypassing the fuse is only a quick means of detecting whether the fuse is bad. It is not a permanent fix. Disconnect the two wires from the fuse and tie them together with a jumper wire, then turn on the dryer. If it runs and heats, the thermal fuse burned out and must be replaced.
A better, faster means of testing requires an electrical multitester set at its lowest RX setting. Remove the two wire leads from the thermal fuse and touch a multitester probe to each wire terminal on the fuse.
If you get a reading of infinity, the fuse is fine. Any reading less than infinity indicates a triggered thermal fuse you will need to replace. Replace the fuse with an exact match for your dryer make and model. Then check the dryer for a reason why the fuse burned out. Sometimes, age wears out a fuse, but other times something else failed and caused exhaust temperatures to rise.
Ensure the power is still off before troubleshooting, then examine the exhaust duct for obstructions that limited air flow.
How to Troubleshoot Fuses on a Kenmore Front Loading Dryer
You may also want to replace the dryer cycling thermostat along with the thermal fuse. If this thermostat fails, it will likely trigger the thermal fuse. Robert Korpella has been writing professionally since He is a certified Master Naturalist, regularly monitors stream water quality and is the editor of freshare.
Korpella's work has appeared in a variety of publications. He holds a bachelor's degree from the University of Arkansas.The thermal fuse in your dryer is important for the safe running of your machine. In fact, thermal fuses can be found in many modern appliances.
The role of the thermal fuse is to prevent fires, by detecting when the dryer drum is overheating, and tripping in response. The dryer will therefore stop running. A thermal fuse is a one-time use component, but luckily, they are inexpensive and easy to replace. Remember, as the thermal fuse is a safety component, do not use the dryer again until you have replaced it.
With a new understanding of what the dryer thermal fuse does, you might still be wondering, where is the thermal fuse on a dryer? The thermal fuse is just 1 or 2 inches long and should be located on the exhaust duct, but the location of the exhaust duct itself may differ depending on your model.
You may now know where to find your thermal fuse, but how can you tell if a thermal fuse has blown? These simple steps summarize the process below:. Once you understand how to tell if a thermal fuse is blown, you can move onto the next step: thermal fuse replacement.
Once you have established that your thermal fuse has blown, you will need to replace it. Luckily, replacing your thermal fuse is a relatively easy task that does not require specialist equipment. The first step towards dryer thermal fuse replacement is to purchase a replacement thermal fuse.
Popular brands include Maytag dryer thermal fusesKenmore dryer thermal fusesand Whirlpool dryer thermal fuses. You should choose the thermal fuse that works best for the make and model of your dryer.
The following is a simple overview of the steps you will take to a successful thermal fuse replacement. Ready to get started with dryer thermal fuse replacement? Visit Repair Clinic and type your dryer model number into our search bar to find thermal fuses for your dryer.
Dryer thermal Fuse bypass
Shop for Maytag dryer thermal fusesKenmore dryer thermal fusesWhirlpool dryer thermal fuses and more. Skip to content Where is the Thermal Fuse on a Dryer? How to Tell if a Thermal Fuse is Blown You may now know where to find your thermal fuse, but how can you tell if a thermal fuse has blown? These simple steps summarize the process below: Unplug your dryer and ensure it is no longer connected to the gas or electric. Locate the thermal fuse, as above. Disconnect the thermal fuse from the wires.
Test the fuse with a multimeter. If the needle on your multimeter does not move, your thermal fuse is blow.Naturally, you want to protect your appliances and keep them operating in peak condition for as long as possible. But did you know that certain appliances have a device that allows the unit to protect itself?
That device is a thermal fuse and it can be found on dryersovensmicrowave ovenseven some dishwashers and refrigerators. This safety device protects the appliance from overheating and potentially damaging the motor or other sensitive components.
Unlike a thermostat that can reset itself, once a dryer thermal fuse blowsit will need to be replaced with a new one before the dryer will run. On electric dryers, the thermal fuse is often located on the blower housing or near the heating element. On gas models, the thermal fuse can be found on the blower housing or near the burner. The number one cause of thermal fuses blowing is the build-up of lint inside the exhaust venting which makes the dryer overheat.
At least once a year you should detach the venting from the rear of the appliance and use a vent brush to clean out the lint and any other debris to ensure good air flow. In addition to fuses, Repair Clinic carries all the replaceable appliance parts to fix your dryer such as ignitersgas valve solenoidsheating elementsthermostatstimersdoor switchesand much more. Will the dryer run if the thermal fuse is blown? If the meter display shows zero Ohms of resistance, the fuse has electrical continuity and has not blown, indicating that another component in the dryer is likely defective and preventing the appliance from running or heating.
If the meter display shows no significant change, the fuse has no continuity which means it has blown and will need to be replaced. Shop Dryer Thermal Fuse Parts.