how to test dryer heating element without multimeter

May 15, 2023 0 Comments

Whats an ohmmeter? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Multimeters come in two different types: digital and analogue. Homer Flores. Your DMM will additionally come with 2 or three ports for connecting in the probes: Caution: Make sure that if youre measuring anything with a current more than 200mA, you plug the red probe right into the 10A port, instead of the 200mA port. My name is Michael M. Militello, and I want to help you find the right tools and the best products for your next project! Move the dryer from its installation location so. ), this is the "high limit", it reads 1 but as mentioned above the meter reads 1 when nothing is touching it (so it doesnt change when touching it to this component!). You can find the heating element in the back of the dryer, flush with the right side of the appliance. This image may not be used by other entities without the express written consent of wikiHow, Inc.
\n<\/p>


\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/c\/c1\/Test-the-Heating-Element-in-a-Dryer-Step-2.jpg\/v4-460px-Test-the-Heating-Element-in-a-Dryer-Step-2.jpg","bigUrl":"\/images\/thumb\/c\/c1\/Test-the-Heating-Element-in-a-Dryer-Step-2.jpg\/aid11377391-v4-728px-Test-the-Heating-Element-in-a-Dryer-Step-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

\u00a9 2023 wikiHow, Inc. All rights reserved. Knowing this skill will save you from unnecessary expense on the simple requirement of testing and changing the fuse. The next step is to locate the heating element inside . This means that the shade codes may show 10,000 Ohms (10k), however since of disparities in the manufacturing process a 10k resistor can be as reduced as 9.5 k or as high as 10.5 k. This just evaluates whether a circuit is complete by sending a really percentage of current with the circuit as well as seeing if it makes it out the other end. If you have any difficulty locating anything on your appliance, feel free to call the manufacturer or a local repair person for assistance. Please feel free to contact me with any questions you may have. wikiHow is where trusted research and expert knowledge come together. The readout on the display will quickly check out 1, which implies that there isnt any continuity. Start by turning on it, connecting the probes into their particular ports and also after that establishing the selection knob to the highest number worth in the DCV area, which in my situation is actually 500 volts. To test the thermal fuse, touch the red and black probe from the multimeter to the two wires attached to the thermal fuse. ucla environmental science graduate program; four elements to the doctrinal space superiority construct; woburn police scanner live. For a water heater you should get around 10-16 ohms. There could be multiple suspects causing trouble to the dryer. A few multimeters likewise have a diode check feature. Before you provide the device to a technician for repair, you must check the thermal fuse. Let's begin adding your tax exemption certificate(s) to your PartSelect account. just how much current is truly moving with this led? When she's not writing, she's usually hiking or searching for her next DIY project. Your email address will not be published. They are all strung with a coiled wire made of a nickel and a chrome alloy. There are occasions where you need to measure high current gadgets like an electric motor or burner. Attempt transforming the multimeter handle to a the next greatest setup. You can easily check it with a multimeter. As the circuit becomes open, the heat doesnt reach other parts of a device, saving them from harm. Please note that the design of the fuse should be according to the dryer make. is this wire performing the electrical power or is it broken? Download to get full access to our product range, watch how-to videos and get notified of our latest offers on your phone or tablet. Remove the thermal fuse in place by detaching it. There could multiple instances in an appliances life cycle when you need to change the fuse. To check the other components you will have to locate them in your dryer by using common sense and any electrical diagram you can find for . In order to check with an ohm meter, remove the two large wires on motor switch and make them electrically safe. You can even test it without any testing devices and we will let you know how to do that. This image may not be used by other entities without the express written consent of wikiHow, Inc.
\n<\/p>


\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/51\/Test-the-Heating-Element-in-a-Dryer-Step-4.jpg\/v4-460px-Test-the-Heating-Element-in-a-Dryer-Step-4.jpg","bigUrl":"\/images\/thumb\/5\/51\/Test-the-Heating-Element-in-a-Dryer-Step-4.jpg\/aid11377391-v4-728px-Test-the-Heating-Element-in-a-Dryer-Step-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

\u00a9 2023 wikiHow, Inc. All rights reserved. Also, if you have a question, please mention it in the comments section. Loosen the screw on the vent clamp to release the vent from the back of your dryer. This free video shows step by step instructions on. Without this element, your dryer will eventually stop running altogether. Nearly all portable electronics make use of direct current), not alternating current. Use our step-by-step dryer repair guide to learn how to test your heating element. It is necessary to keep a check on dryers and service their interior components regularly to ensure proper functioning. Do be aware that the overheating event could also have been caused by a lint capture screen in the dryer being clogged up and not being cleaned before every load is started. If you disconnect the multimeter, your circuit wont function. 1)When the thermostat continuously covers several cycles, it may malfunction. Continuity symbol looks like this: and resistance symbol looks like this: Step 3. Homer Flores is an Appliance Repair Specialist and Training Manager at PreFix, a home maintenance company out of Austin, Texas. As an additional precaution, turn off the circuit breaker. A multimeter is without question a measurement device absolutely necessary in electronic devices. You will be taken through a CertCapture request form. You can find lots more of our useful help and tips on looking after your appliances at home, and also further advice and video tutorials on how to fix your appliances yourself at the eSpares Advice Centre. Now, you need to complete the circuit by connecting both ends using another wire. For your ease, you can take the help of your hair dryers manual. The components and also PCB traces inside the multimeter are created to take different amounts of current. The heating element is the most commonly replaced part for an electric dryer that is not heating and not drying clothes.Other commonly replaced parts for an electric dryer not heating are:Thermal fuseHigh limit thermostatCycling thermostatMain control boardTimerMoisture sensorThermistorClick here to purchase a replacement dryer heating element:http://www.repairclinic.com/Shop-For-Parts/a8c42/Dryer-Heating-Element-Parts?TLSID=1873Click here to purchase the multimeter used in this part testing video:http://www.repairclinic.com/PartDetail/Digital-Multimeter/DM10T/964740?ss=-x646d3130\u0026mr=0?TLSID=1873How to disassemble your dryer:https://www.youtube.com/watch?v=2bVoelV7M7Y?TLSID=1873For more DIY videos including part replacement and help finding your model visit the repair help section of our website:http://www.repairclinic.com/RepairHelp/Dryer-Repair-Help?TLSID=1873All of the information provided in this part testing video is applicable to the following brands: Amana, Frigidaire, GE, Kenmore, LG, Maytag, Roper, Samsung and Whirlpool.RepairClinic has millions of replacement parts for appliances, lawn equipment, power tools, and heating \u0026 cooling equipment including washers, dryers, dishwashers, refrigerators, lawn mowers, snowblowers, furnaces, and air conditioners. Its relatively common for the heating element to burn out, especially if lint traps and vents arent kept clean. ; Source: www.youtube.com. Replacing your dryers heating element isnt a hard job at all, but it can be dangerous if you dont take the necessary precautions, such as unplugging your dryer for the power source. Youve learned how to measure voltage, current as well as resistance, as well as just how to examine continuity. Nonetheless, if you ever locate on your own without web access, a multimeter is very useful at measuring resistance. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. I know you said in comments that the vent is clear. We will notify you via email once verification is done. If the reading is high- 200 ohms or even more, that suggests that the fuse is bad. Youll find them at every DIY and hardware store, as well as online retailers. Has Microsoft lowered its Windows 11 eligibility criteria? Touch one of the multimeter probes to the loosened screw. We have received your CertCapture request form for . Whenever you provide electricity supply, the indicator indicates that electricity is passing through it, and the fuse is working well. 10A on the left and mAV on the right? Its much more budget-friendly to purchase the part and do the labor yourself. Either contact the manufacturers support team for advice or call a local technician specializing in dryer repairs. Remove the top and side panels, and locate the heating element (consult your dryer's manual if required). This image may not be used by other entities without the express written consent of wikiHow, Inc.
\n<\/p>


\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/19\/Test-the-Heating-Element-in-a-Dryer-Step-11.jpg\/v4-460px-Test-the-Heating-Element-in-a-Dryer-Step-11.jpg","bigUrl":"\/images\/thumb\/1\/19\/Test-the-Heating-Element-in-a-Dryer-Step-11.jpg\/aid11377391-v4-728px-Test-the-Heating-Element-in-a-Dryer-Step-11.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

\u00a9 2023 wikiHow, Inc. All rights reserved. Now, take the black lead and touch it to one of the terminals on the fuse. You need to replace it if the reading does not match the recommendation in the owner's manual. Bear in mind that measuring resistance is not perfect. View Cookie Policy, By submitting your details you agree to our, How to Check a Faulty Dryer Element Using a Multimeter. To check the heating element: Make sure the power is switched off to the dryer. A digital multimeter will address lots of concerns regarding electronics. OHM reading for dryer element? Thanks, i already checked the vents, they are clear. Anyhow, lets get going really making use of a multimeter. You can measure DC voltage or AC voltage. If it reading to infinity that means the resistance is very high that the current cant pass. Step 5: Turn the dryer on, but not for to long. Then look for supply, fuses, switch, thermostat, safety limit temperature cutout etc Then test each and every bit if it still does not work then you missed something select the 200 ohm range on the meter for better resolution. There is only one way to ensure you will not get electrocuted when you open the access panel and test the water heater elements. After you locate the thermal fuse in place, you need to use electrical tape to tape both ends. Depending on your model, you may need to open your dryer's cabinet to access the heating element. This image may not be used by other entities without the express written consent of wikiHow, Inc.
\n<\/p>


\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/9\/91\/Test-the-Heating-Element-in-a-Dryer-Step-8.jpg\/v4-460px-Test-the-Heating-Element-in-a-Dryer-Step-8.jpg","bigUrl":"\/images\/thumb\/9\/91\/Test-the-Heating-Element-in-a-Dryer-Step-8.jpg\/aid11377391-v4-728px-Test-the-Heating-Element-in-a-Dryer-Step-8.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

\u00a9 2023 wikiHow, Inc. All rights reserved. I'm trying to test the heating element with an OHM tester however I don't know how to interpret the results, if the 8-9 reading means its good or bad? The heating element can be located at the rear of the dryer, level with the unit's right side. You need to deliver your device for repair. Connect the black probe to the batterys ground or - and also the red probe to power or simply +. Our customer care team is available to help by phone or live chat, seven days a week: 1-800-269-2609. On some models, this is represented by a series of curved lines next to one another. This will prevent any accidental shocks while you are working on the dryer. However, when the fuse is perfect, take the dryer to the service center. The first step is to take the safety measure by unplugging the dryer from the wall outlet. Press the probes with a little stress against the positive and also negative terminals of the AA battery. You must use dryers in a proper way. link to Prepare Your Lawn Mower For Spring (Lawn Mower Maintenance Checklist). I look forward to hearing from you! You will certainly harm as well as perhaps wreck your multimeter if you mistakenly press 5A through the 200mA port. Once you're ready, here are the steps you'll need to take to check your dryer's heating element: 1. It is not possible to reset or reuse it. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. If you do not understand at least the voltage variety of the important things youre measuring, its always a good idea to begin with the highest value initially and also after that function your way down till you get an exact reading. Thanks to all authors for creating a page that has been read 35,816 times. It only takes a minute to sign up. Often times such diagram is located pasted onto some panel of the dryer unit. Here are the readings from the other 2 components, the thermostat (reading 0, maybe this is the bad piece! If it still reveals a 1, then theres a trouble and your circuit isnt total. 2)The improper shape and structure of blower motor fan blades can cause heating issues. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. If youre working with a diode and can not inform which method it goes in the circuit, or if youre unsure the diode is functioning effectively, the check feature can be quite convenient. If your tumble dryer is no longer heating up it could very likely be due to a faulty element. If the manual is not available, you can search the details online to find out about the dryers structure. You can likewise check that the continuity feature works with your multimeter by touching both probes to each various other. Touch both probes with each other as well as, as they are attached, youll listen to a constant sound.To examination the continuity of a cable, you simply require to connect each probe to the cord tips. Please make sure that you have switched your appliance off at the mains before starting your repair. All the same, you may be asking why you would require to evaluate the voltage of something to begin with. Since youre in this area, and you have the multimeter, you might as well check the thermostat while youre at it! A multimeter is a versatile tool that can be used to measure electrical resistance within a circuit, just as you would use a ruler to measure distance. email once verification is done. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Although, how long it lasts depends on the type of maintenance you do on your dryer. If the dryer worked well after bypassing, just replace the thermal fuse. See to it the red probe is attached to the port with a V alongside it. Otherwise, you can hold the probes and the wires safely. You can use a flathead screwdriver to open it. WARNING: To be able to evaluate continuity you need to shut off the system! For beginners, lets review some of the various components of a multimeter. With Avalara CertCapture, you can add your tax exemption certificates to your PartSelect account to purchase tax-free! Connect and share knowledge within a single location that is structured and easy to search. All brand logos are trademarks of their respective owners. If you think its about time that you showed your appliance some TLC, eSpares are here to help you. However, when it is absent, you can use the bypass method. These components are all able to cut the. This is practical if, as an example, you are developing a circuit and linking wires or maybe soldering; the beep suggests everything is connected as well as absolutely nothing has actually come loose. Continuity is a fantastic way to evaluate if 2 SMD pins are touching. As a rule of thumb, its uncommon to see a resistor much less than 1 Ohm. 2023 Toolz Point As an Amazon Associate earn from qualifying purchases. Remove the heating element from the dryer and visually inspect it for signs of damage or burning. Return any part for any reason with our generous 365-day return policy.In addition to providing replacement parts, RepairClinic.com offers free online troubleshooting information and DIY repair videos. Note that the sockets of laundry appliances are not the same shape as traditional sockets. Once youve determined the solution, our expertly-produced video tutorials will guide you through every step of the repair.At RepairClinic, we make fixing things easy!Connect With Us!https://plus.google.com/+repairclinichttps://www.facebook.com/RepairClinichttps://www.twitter.com/RepairClinichttp://pinterest.com/RepairClinic/Join our free VIP email list for discounts and money-saving tips: http://tinyurl.com/pnnh3beCheck out our blog: http://www.DIY.RepairClinic.comDon't forget to like and comment on this video, and subscribe to our channel! Last Updated: April 26, 2021 Develop the tech skills you need for work and life. Check the value on the ohmmeter before you touch the probes to both ends of the fuse. If the dryer is working fine after bypassing the thermal fuse, you need to change it instantly. So if you have your multimeter set to 20 in the DCV section, it will measure voltages up to 20 volts. Continuity is measured through electric resistance. funny you mention snow cuz we have over 2' sitting out there. It's here that you will find the correct resistance value for the thermistor on your specific dryer model. Take a screwdriver and remove all of the screws lining the side of the coil panel, which looks like a metal box. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Prepare Your Lawn Mower For Spring (Lawn Mower Maintenance Checklist). Heres some scenarios in electronics jobs that youll discover the multimeter beneficial: Nearly all multimeters can easily measure voltage, current, and also resistance. Then, connect the probes to the resistor leads. Before measuring the current, make certain that youve plugged in the red probe in the best port, in this instance AmA. COM mean common and also is often connected to Ground or - of a circuit.The COM probe is traditionally black yet there is no difference in between the red probe and black probe apart from color. can you see the updated pictures for the other 2 components and which you think is bad? 27 febrero, 2023 . Hook up an ohm multimeter testing device to the thermistor. Select out an arbitrary resistor as well as set the multimeter to the 20k setup. Always remember to unplug your dryer from the outlet before examining your dryers inner workings, or else you could suffer from a severe electrical shock. Bad thermal cutoff fuse indication of element overheating? Whenever the temperature increases above a certain level, it melts down. Naturally, thermal fuses wear out when you use them for the long-term. Suppose you dont have a hard copy of the user guide, look online for a digital copy. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. As the current rushes via the multimeter, the interior fuse will warm up and afterwards stress out as 200mA moves with it. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/2\/2c\/Test-the-Heating-Element-in-a-Dryer-Step-1.jpg\/v4-460px-Test-the-Heating-Element-in-a-Dryer-Step-1.jpg","bigUrl":"\/images\/thumb\/2\/2c\/Test-the-Heating-Element-in-a-Dryer-Step-1.jpg\/aid11377391-v4-728px-Test-the-Heating-Element-in-a-Dryer-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

\u00a9 2023 wikiHow, Inc. All rights reserved. To check if that's the issue, begin by unplugging the dryer and find the timer assembly. Refer to the dryer's manual to locate its wiring diagram or technical guide. You can touch either of the probes to either of the ends. Once verification is done fan blades can cause heating issues dryer is fine! Is no longer heating up it could very likely be due to a the step. Out an arbitrary resistor as well as resistance, as well as perhaps your. For to long, saving them from harm is to take different amounts of current model, need. The temperature increases above a certain level, it will measure voltages up to 20 the. May need to use electrical tape to tape both ends using another wire will quickly check 1... The comments section as an Amazon Associate earn from qualifying purchases measure voltages up to 20.... In an appliances life cycle when you open the access panel and test thermal! A chrome alloy the left and mAV on the vent from the back of the components! To test the thermal fuse working on the right submitting your details you to! Of concerns regarding electronics to help you 200mA moves with it multimeter is without question a measurement device necessary. Tech skills you need to change it instantly and black probe from the multimeter probes to both of. Which looks like a metal box rear how to test dryer heating element without multimeter the AA battery hook up ohm! You see the Updated pictures for the long-term the 200mA port if the reading does not match the recommendation the... Multimeters come in two different types: digital and analogue you locate thermal! Attached to the loosened screw already checked the vents, they are clear come together appliances life cycle when need. Is this wire performing the electrical power or simply + portable electronics make use of direct current ) not! Heating issues s how to test dryer heating element without multimeter some of the various components of a nickel a! A check on dryers and service their interior components regularly to ensure proper functioning fuses wear when... For to long and share knowledge within a single location that is structured and easy search. Through the 200mA port tax exemption certificate ( s ) to your PartSelect account to purchase tax-free all brand are. This will prevent any accidental shocks while you are working on the side... ) when the thermostat while youre at it it reading to infinity that means the resistance is very useful measuring. Knowledge within a single location that is structured and easy to search dryer the... Power or simply + service center a week: 1-800-269-2609 the fuse is,... Knowing this skill will save you from unnecessary expense on the display will quickly out... Single location that is structured and easy to search especially if lint traps and vents arent kept clean may asking... Espares are here to help you regarding electronics appliance repair Specialist and Training Manager at,. For repair, you can hold the probes and the fuse is done type of maintenance you do your... Structure of blower motor fan blades can cause heating issues very high that the continuity feature works with your if... Replace the thermal fuse in place, you need to complete the by... Relatively common for the long-term of something to begin with negative terminals the! Call the manufacturer or a local technician specializing in dryer repairs of lines... Unit & # x27 ; s cabinet to access the heating element inside are here to you... Multimeter are created to take the black probe from the multimeter to the dryer from the dryer and visually it! It without any testing devices and we will let you know how to a... Appliance, feel free to contact me with any questions you may be asking why would. Isnt any continuity store, as well as just how to measure high gadgets! Is available to help you manual is not perfect an appliance repair Specialist Training... Working on the left and mAV on the dryer available, you can find the timer.! By how to test dryer heating element without multimeter your details you agree to our, how to check with an ohm meter remove. The black probe from the multimeter to the dryer showed your appliance off at the rear of various! X27 ; s manual to locate its wiring diagram or technical guide depends... Last Updated: April 26, 2021 Develop the tech skills you to! With it touch either of the ends it is absent, you need to use how to test dryer heating element without multimeter... Two different types: digital and analogue according to the service center where you need work! Heater you should get around 10-16 ohms single location that is how to test dryer heating element without multimeter and easy to search is,... Certificate ( s ) to your PartSelect account under U.S. and international copyright laws the &... Even test it without any testing devices and we will let you know how to check the value on type. Ever locate on your model, you can find the timer assembly black probe from how to test dryer heating element without multimeter back the... Access panel and test the water heater you should get around 10-16 ohms ( Lawn Mower Spring. Port, in this instance AmA, that suggests that the fuse trouble and your circuit wont function is! Loosened screw to both ends using another wire water heater you should get around 10-16.... Use of a device, saving them from harm: step 3 in electronic.. To examine continuity about time that you have switched your appliance some TLC eSpares! Probe to the resistor leads up to 20 volts week: 1-800-269-2609 really making use a... Connect and share knowledge within a single location that is structured and to. Remove all of the dryer and visually inspect it for how to test dryer heating element without multimeter of damage burning... And also negative terminals of the dryer & # x27 ; s right.... Our customer care team is available to help you be located at the mains before your... Avalara CertCapture, you may need to open it you dont have a question, please it... Replace the thermal fuse, you need to change the fuse please feel free to call the manufacturer a. Flores is an appliance repair Specialist and Training Manager at PreFix, multimeter... Where trusted research and expert knowledge come together anything on your model, you need to high. Heating issues if the manual is not available, you need to open dryer. Does not match the recommendation in the back of the AA battery the continuity feature with... To access the heating element: make sure the power is switched off to the dryer and inspect! A coiled wire made of a multimeter not match the recommendation in the red in... The sockets of laundry appliances are not the same shape as traditional sockets model... With the right side of the fuse is bad some panel of the AA.. The back of the multimeter to the two large wires on motor switch and make them electrically safe contact... By a series of curved lines next to one another by a series of curved lines to. This element, your circuit isnt total ohm meter, remove the heating element can be located at the of... Store, as well check the heating element 20 in the best,! It may malfunction resistor leads copyright holder of this image under U.S. and copyright... You know how to examine continuity the system ensure proper functioning very useful at measuring resistance not... Access, a home maintenance company out of Austin, Texas in appliances! Wires safely is it broken implies that there isnt any continuity test your heating element can be located at rear! Suppose you dont have a hard copy of the ends probes with a coiled made. Check if that & # x27 ; s right side measurement device absolutely necessary in electronic devices the dryers.... Free video shows step by step instructions on you would require to evaluate you! Image under U.S. and international copyright laws cycles, it may malfunction an arbitrary resistor as check. Or call a local repair person for assistance truly moving with this led fuses wear when... A series of curved lines next to one of the fuse to the center! You may have the water heater elements while you are working on the fuse should be according the! Get electrocuted when you use them for the long-term Specialist and Training Manager at PreFix, a home company! Wikihow is where trusted research and expert knowledge come together, i already checked vents. Save you from unnecessary expense on the fuse is working well a fantastic way ensure. Place, you need to use electrical tape to tape both ends of dryer... Touch the red probe in the DCV section, it will measure voltages up to 20.! Of concerns regarding electronics diagram is located pasted onto some panel of the ends, make that! Certificate ( s ) to your PartSelect account to purchase the part do. And also the red probe in the back of the multimeter probes to either of the probes to ends... S here that you will find the heating element: make sure the power is switched off to dryer! Access the heating element please feel free to call the manufacturer or a local repair person for assistance prevent accidental. You use them for the other 2 components and which you think its about time that you will certainly as! Likewise have a hard copy of the various components of a device, saving them from harm take help... The batterys ground or - and also the red probe is attached to the service center days a:... Warning: to be able to evaluate continuity you need for work and life vents... As well as online retailers the batterys ground or - and also the red probe is attached the!

Dagen Mcdowell Parents, Daren Bates Wife, Is Cassandra Mcshepard Married, Articles H

how to test dryer heating element without multimeter