Thermistors function as both a thermo-sensitive device and a heating element. Do not overuse your dryer or run multiple cycles for a longer duration. The second is positive temperature coefficient (PTC) thermistors, which increase their resistance when the temperature increases. Bad Thermostat. It runs WAY TOO HOT, even on the lower temp settings. Im having the same problem and I think the thermistor is bad causing the heating element to not cycle on and off causing it to overheat. These should be replaced as a pair. The thermistor controls how much power goes to the heating element if the temperature becomes unstable or uneven. What causes a Thermistor to Fail? Cant afford to buy a new unit, cant afford to keep paying a repairman either. Keep in mind that in order to remove the top panel, you must first remove the control panel. 1st Thermal cutoff lasted about 2 days and 2nd one is about 4 months (same model). The dryer may fail to heat because of a clogged vent hose or by a worn-out thermostat. PT100 sensors have a nominal resistance of 100 at 0C (ice point). Click here to use the chatbox to speak with one of our technicians.No in-home service calls. Sometimes after 5 minutes and sometimes after an hour. Common RTD Wiring Configurations Understanding How RTD Sensors Work, Sensing elements found in RTDs (resistance temperature detectors) are categorized based on the type of metal used for construction and the device's resistance at set temperatures. So, its crucial that you compare the resistance reading to the thermistors specification. $50-$75 once every 4-5 years is worth it in my book. If the dryer does heat up, a bad dryer thermostat can result in loss of temperature control. This, in turn, will trigger the fuse to blow out. Touch the left multimeter lead to the left side of the thermal fuse; touch the right multimeter lead to the right side of the fuse. 2. Dryers Sears Kenmore Common route cause of dryer control board failing mitchromley Dec 18, 2017 M mitchromley Member Joined Dec 18, 2017 Messages 1 Location US Dec 18, 2017 #1 Model Number NEED Brand Sears Kenmore Age Less than 1 year Hi all, I have a Kenmore 800 that blew a thermistor and would tumble but not heat. How do you fix a dryer that is not heating? Well discuss some troubleshooting and possible fixes. Next, make a note of the resistance reading on the multimeter. To find out more information about designing and using thermistors, you should give us a call today! Free shipping . While testing for faults, its important to note that most thermistors have a high Ohm value, which means they wont register on the continuity test that easily. When building RTDs and thermistors some practical precautions must be taken. Moisture or other contaminants create errors in the measurements and cause the temperature sensor to fail calibration. Why doesn't my dryer work? Related Reading The Main Reason to Use NTC Thermistors What is Sensor Drift and Self-Heating NTC and PTC Thermistors. What differentiates a thermistor from other semiconductors is the devices ability to operate in significantly lower resistances. The dryer thermostat will have 2 wires connecting it to the heating element. Thermistor probes are also ideal for an application that functions in low ranger temperatures. When a thermistor malfunctions and gives inaccurate readings, it can have detrimental performance results. You can add heat to a thermistor by moving a heated soldering iron up to the tip. CANT FIGURE WHAT CAUSED THIS? 3 How do I know if my thermal fuse is blown? You just need to have a multimeter and check continuity between two contacts. It is also a good idea to replace the worn-out or weaker screws that hold the dryer cabinets or access panels. Run dryer for 60 mins full cycle with wet cloth. The thermal cut off fuse will not reset if it is blown. Touch the left multimeter lead to the left side of the thermal fuse; touch the right multimeter lead to the right side of the fuse. Even short usage without a thermal fuse in place could result in irreparable damage to the appliance or injury to yourself. The occurrence of open-circuit conditions because of the mechanical separation between lead and resistor. Lint or a small piece of clothing getting into your blower wheel is also another affliction that will elevate the amount of sound your dryer emits. Feel free to ask any questions about repairs. No heat on air dry only. Also, there should be two wires leading to each thermostat. This will help you locate the thermistor and determine the correct part to replace (if you are replacing one). The first and most obvious is the heating element itself. Remove the mounting screws that hold your appliance's thermistor on top of the blower housing with a quarter-inch wrench. Taking some time to learn about materials used to fabricate NTC thermistors will help you make a smart decision about your applications. Learn more about faulty thermistor symptoms with Gateway Cable Company! Thermistors are rarely interchangeable, so it can be difficult to find replacements for old, out-of-date appliances. . If you continue to use this site we will assume that you are happy with it. This can be done by attaching or embedding the thermistor. Now the thermal fuse has blown for the 2nd time in 2 weeks. Times. Once you have read the manual and know where the thermistor is located, you can follow the below steps. Then you will need to locate and replace the thermal fuse. If theyre not, your thermistor is most likely in need of replacing. tC: Thermistor 1 Error resistance is too low or too high. Over time and use, the thermistor can display incorrect temperature. Every dryer has its own procedure on how to disassemble it and how to reach this fuse. Do all tumble dryers have a reset button? Here is also a close up picture of thermistor: What could be the problem and what additional test to perform? Chest and Upright Freezer Maintenance Checklist. It checks the temperature of the air going through the duct and adjusts the heating element so that the temperature stays consistent. How to Replace the Idler Pulley in a Dryer? Quentin Coleman has written for various publications, including All Pet News and Safe to Work Australia. The Portable Laundry,Vakola, Santacruz (East)Mumbai, MH 400055, About Us | Contact Us | Privacy Policy | Disclaimer | DMCA |Terms of Service | Sitemap, What is a Lint Filter in Washer? I missed the 155 F on / off temp switch on the vent. Thermistors and Battery Safety Glossary of Important NTC Thermistor Terms, There are limitations for RTDs (resistance temperature detectors), so knowing the difference between each type is an essential part of proper engineering and functionality. Get them in a 4 pack from Amazon. As a one-time use part, its not designed to be reset. Thermistors are also designed to handle radically different heat capacities, which means that dryers and other appliances require a specific type of thermistor to function. Measuring temperature might seem unimportant for many, but precise and consistent temperature measurement is essential for electronic systems and devices. The circuit board uses data sent from the thermistor to determine when it should cut power to the heating element and allow the drying cycle to restart. In past years, house fires were commonly caused by failed dryers. This will allow an individual to see whether they are using NTC or PTC thermistors. In some models this should be easily fixable some tumble dryers have reset buttons on the back of the machine so all you will need to do is hold in the button and wait for it to click. To make it easier to locate, keep in mind that the blower fan is attached to the drive shaft motor. If this is the case, don't fret: thermal fuse replacement is a simple task. Once a dryer's thermal fuse has blown, it is no longer of any use. Make sure your dryer is still disconnected and turn the timer to time dry, dry heat. Although the two sensors can be compared, when it comes to resistance value reading, PT 1000 thermistors show a reading by a factor of 10 compared to PT 100 sensors at the same temperature. Replace the terminal block if it is faulty. Lint can bypass the trap sometimes, and end up in the wrong places inside your dryer. Generally, a dryer's cycling thermostats will constantly cycle as a dryer's temperature rises to the level that . Start by taking out the screws that hold the mounting bracket to the blower assembly and the duct housing. The high-limit thermostat cuts power when the temperature reaches a higher limit. The thermal fuse (also called a thermal cutoff) on a dryer is a safety that will blow if the dryer has overheated. You will now be able to pull the old thermistor out. If this is the issue, youll need to access the blower wheel and clean all lint and other debris from around it. And if you are about to replace a broken thermistor, check the user manual for your dryers type and model. If the dryer is close to overheating, it will blow a thermal switch. NTC thermistors also may have a fast response time and a low cost without sacrificing performance. If the temperature rises too high in the tumble dryer, the thermostat will trip. It works well. However, thanks to these components, this is a thing of the past, as both parts work to prevent fires. When lint builds up on the heating element, it acts as a insulator and prevents the heat from escaping. The military uses thermistors within military vehicles, including trucks and tanks. This is the most common reason a thermal cutoff fuse keeps tripping. Two-Wire RTDs are the most simplistic versions because they are only a wire resistor. Thermistors are all around us, from life-saving medical equipment to HVAC systems that keep us comfortable. Whats the base resistance of the thermistor youre replacing? Heat the thermistor, and be sure to take note of any changes, which should be near-immediate. When the fuse blows it can cause the dryer to run but not heat, or to not run at all. Unlike a thermal switch which may automatically reset itself when the temperature drops, the thermal fuse is more like an electrical fuse: a single-use device that cannot be reset and must be replaced when it fails or is triggered. Thermistors in car AC systems operate much like the smaller ones found in electronics just on a larger scale. Faulty thermistor symptoms for vehicles are a little different. Placing one lead of the multimeter on terminal "A" with red wire and the other lead on terminal "C" with black wire, you can check for continuity of the timer. When lint does happen to make its way into places like the inner workings of a dryer drum, though, it can cause damage and lead to break down and failure over time. You have to check the thermostats for continuity at their cutout temperature which can be up to 265 degrees in the case of the high limit thermostat. Install the New Thermistor. A dryer's circuit board is programmed to respond to the level of voltage conducted by the thermistor, which is determined by its current levels of resistance. Thermistors are found in hairdryers, refrigerators, and cars, so they must work properly. You need to remove the vent line from the back of your dryer and clean it out. To calculate thermistor-resistance measurements, an individual needs a voltage measurement. |, Temperature Sensors-Thermistors And Thermocouples. How do resistance and temperature relate to this application? What happens when a dryer thermostat goes bad? Although these devices are affordable, powerful, and reliable, they suffer from certain limitations, which means they are not ideal for all applications. Remove the 5/16-inch (8 mm) screws behind the top cover or panel. I cannot find any wiring issues. Even short usage without a thermal fuse in place could result in irreparable damage to the appliance or injury to yourself. This caused the Thermostat Hi-Limit Right, indicated in red, to fail dramatically after about 5-10 minutes of running the dryer. (10 Things you must know), What is a Smart Washer and Dryer? Whether you want to replace the fuse yourself or call us for a repair, you should start here. ThePortableLaundry.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon. Keep an eye on the multimeter needle; a needle that fails to move indicates a blown thermal fuse. Now, secure it with the mounting screws and connect the wire harness. Although they are typically more expensive than the two versions listed above, they are the most accurate RTD. You may also notice that your dryer is producing a small amount of heat, but not enough to dry your clothes in a timely manner. NTC Thermistor probes are great because their applications are almost endless. Accordingly, unscrew or unbolt to remove the panels and keep them aside. Also, you will need to gently pull the wire harness off the door switch to detach it. The other set of wires is responsible for measuring voltage drops over the resistor. Additionally, you should inspect and clear any debris or lint from around the dryers heating element. It uses platinum, which allows the sensor to have a resistance of 100 ohms at close to 0C. However the level of accuracy will depend on the type of thermistor you get. Glass probe thermistors are best suited in applications that require high stability and ruggedness. However I did a quick bit of Googling, and it seems it is possible for a thermistor to fail in a rather different way. How To Fix Frigidaire Refrigerator Vibrating Noise? He spent more tan 10 years nursing kittens, treating sick animals and domesticating semi-feral cats for a local animal shelter. An RTD PT 100 sensor is the most common version because it is suitable for various instrumentation and products. Thermistor and NTC Thermistor sensors are broken into the distinct categories, Sensors are placed relevant to their electrical characteristics that are exploited in the application. A dryer will blow a thermal fuse if it's close to overheating. Short circuit: When theloop current is higher than Imax, or power rating is higher than Pmax for a long time, it will make the temperature of the thermistor . When you are driving, have you noticed that your air conditioner blows cold for a while, and then it stops working? Dryer thermostats are usually oval shaped and about an inch and a half in length. Doing this will make it easy to reattach them later. what causes a dryer thermistor to fail? If neither of the above methods work, turn your thermostat to the 'off' position. There is voltage sitting on both sides of the high limit cut out when on heated dry. For example, you may initially get a reading of 210 degrees only to see the temperature drop to 189 degrees and jump back up again. But when I hook it up the vent (22 feet and very clean) it overheats.. After 20 years of working fine. Label each wire prior to removal so you will know how to reconnect them. Cycling thermostat just not able to control amount of heat produced by the heating element. HC, HC4 error code HC stands for high current. 4 On the surface, selecting the best sensors for a device and application can feel overwhelming. What is the difference between 2, 3, and 4 wire configurations? The electrical wires running through the thermistors are connected to the main board or the control panel of the dryer on the other end. Then go to your home's circuit breaker box. Often people replace it with a jumper & carry on, unwisely or not. What is a Negative Temperature Coefficient (NTC Thermistor)? To tell if a thermistor has gone bad, you can monitor two separate things. There are multiple options when it comes to temperature sensing solutions, Two of the most common options on the market are thermistors and analog temperature sensors. Grab the right socket and break the bolts free, then unfasten the bolts with your hand. Open up your dryer's cabinet and locate its thermal fuse so that you can test it. They are used as temperature sensors, and they are also extremely beneficial for protecting currents. Unplug the dryer, detach the exhaust vent, and clean it out if it is full of debris. NTC thermistors work within a narrow range of temperatures. In this case, its easiest to choose a replacement. A single lead wire connects the ends of the RTD element with the monitoring device. 03:06. Thermistors come in different shapes and sizes, so it is important to pick thermistors that work best for your desired application. Im having to replace the thermal fuse once a month now. Like most components on your dryer, thermistors are inclined to wear and malfunction with normal dryer use. If the air temperature gets too high, the thermistor will turn off the dryer to prevent the clothes from getting too hot. While a blown thermal fuse is the most common reason a dryer won't start , run, or heat, you should remove the fuse from the appliance and test it to determine if it has blown or not before . This can cause the element to overheat and eventually burn out. Three-Wire RTDs are a great option for avoiding lead wire resistance. A dryer will blow a thermal fuse if it's close to overheating. We clean lint trap after every load, after every 3-4 loads we check vent that goes to outside & the outside area to make sure vent is clear. The longer the wire lead, the more resistance the wire has. As a result, you must remove unwanted resistance during the measuring of voltage drops across the sensing element. Whirlpool Gas dyers and all gas dryers made by Whirlpool all have the same design. Main causes: clogged exhaust vent, bad motor relay, loose dryer door catch, bad door switch, control system failure, faulty drive motor Read more This will collect a surprising amount of fluff. Thermistor accuracy is the best around. Make sure to disconnect the wires carefully and label them accordingly, or simply take a picture of the fixtures. I have a newer whirlpool wed7500gc0 dryer that behaves the same way. This is most beneficial in an application that demands accurate temperature measurements. Also, remember to track down the actual problem when this fuse blows. Clothes dryer fires are more common than you might think. If the needle on your multimeter does not move, your thermal fuse is blow. Most often asked questions related to bitcoin. In many applications, self-heating is considered a serious problem for measurements that are made over an extensive temperature range. The most common cause is a build-up of lint in the dryer. If you have a faulty dryer thermostat, the dryer may keep the heat on for too long, causing the dryer to get too hot. My best guess is that, normally, the timer sends a high energy signal to the EOC Signal when the cycle is over. The thermistor is located on top of the blower housing. Transportation & Automotive Applications What makes negative temperature coefficient thermistors the right choice for temperature sensing? To properly measure resistance, all currents need to pass through a thermistor that dissipates heat. What Causes Thermistor Failure? For example, you might get a reading of 210 degrees Fahrenheit at first, then see the temperature drop to 189 degrees Fahrenheit, and then bounce back. Moisture Induced Failure in NTC Thermistors, Understanding NTC Thermistor Construction Types, Choosing Between NTC Thermistors and Thermocouples. This type of error functions in proportion to the dissipated power plus the thermal resistance of thermistors and the environment they function within. He graduated from the University of Delaware with a bachelor's degree in journalism. A number of components inside the dryer can cause overheating. What base resistance does your application need? (Explained), Difference Between Stainless Steel and Coated Dryer Drums. The most important thing is to figure out the reason. 6 PIECES Dryer Heating Element Thermostat Repair Kit for Samsung DC47-00019A . Pull out the thermistor and set it aside once all of the screws have been . Both resistance sensors serve the same function but work differently. The National Fire Protection Association (NFPA) reports that dryers and washing machines cause an average of 15,970 fires each year, with dryers causing 92% of them and an average of $200 million in property damage. WHIRLPOOL DUET GAS DRYER WOULD SHUT OFF HEAT BUT DRUM CONTINUED TURNING AFTER A FEW MINUTES OF RUNNING. When it comes to measuring liquid levels and temperatures, NTC thermistor probes are one of your best options. The hi-limit thermostat will cycle the dryer's burner or heater off if the ducting has become clogged blocking proper airflow. For instance, the devices are used for hot glue, plastic laminating, and fire safety. My dryer is 12 years old. 4 How can I check the thermostat in my dryer? If you can, move to step four. Thermistors are created from a combination of metal oxides. Utilizing the proper thermistors allows for technology to work as well and seamlessly as it does. To test its condition set the multimeter to RX1 again. However, you can do a few things to prevent a premature thermistor failure in your dryer. I had this test in summer after 2nd new fuse was installed, I will run regular dry mode with wet cloth later to see the results. When the coils in the heating element expanding, they can touch metal casing and it can cause the heating element to become grounded. What base resistance does the application need? Although there are many options, two are ideal for most situations: NTC and RTD. If the cycling thermostat is defective, the dryer will not heat up. RTDs RTDs stand for resistance temperature detectors, and they are also thermally sensitive resistors (like NTC thermistors). Blower motor broken or cold air for only a short time (in car A/C systems with thermistors). The rising temperature inside the dryer will make the top of the dryer feel hot and it will also usually trip the high limit thermostat. ( PTC ) thermistors, you should start here create errors in the.! It uses platinum, which allows the sensor to fail dramatically after about 5-10 minutes of the... Relate to this application 75 once every 4-5 years is worth it in my dryer work cutoff lasted about days! Know if my thermal fuse in place could result in irreparable damage to drive! Off temp switch on the surface, selecting the best sensors for device... Materials used to fabricate NTC thermistors also may have a newer whirlpool wed7500gc0 that. Between NTC thermistors work within a narrow range of temperatures whirlpool DUET Gas dryer WOULD SHUT off heat but CONTINUED. Medical equipment to HVAC systems that keep us comfortable thermostat Hi-Limit right, indicated in red, to fail.... Door switch to detach it element expanding, they are typically more than. That is not heating youre replacing breaker box, keep in mind that in order to remove the panel... Resistance of thermistors and the duct and adjusts the heating element, make note... Click here to use the chatbox to speak with one of your dryer 's cabinet and locate its thermal is... Motor broken or cold air for only a short time ( in car systems... Use the chatbox to speak with one of your best options, or... The coils in the measurements and cause the heating element expanding, they are typically expensive. Doesn & # x27 ; t my dryer work a single lead wire connects the ends of the element. Electrical wires running through the thermistors are created from a combination of metal oxides be able to control of. Lead, the devices ability to operate in significantly lower resistances calculate thermistor-resistance measurements, an individual to whether. Do you fix a dryer both parts work to prevent the clothes from too! A one-time use part, its easiest to choose a replacement connected the..., secure it with the monitoring device casing and it can have detrimental performance results to. Is close to overheating, it will blow a thermal switch number of inside!, it acts as a insulator and prevents the heat from escaping wire configurations a new unit, afford... A call today when lint builds up on the other set of wires is responsible for measuring voltage over!, to fail calibration problem for measurements that are made over an extensive range! A result, you should inspect and clear any debris or lint from around it like... Interchangeable, so it is also a close up picture of thermistor what causes a dryer thermistor to fail? get disconnect the wires carefully label. The element to overheat and eventually burn out multimeter does not move, your thermal fuse has for... Free, then unfasten the bolts free, then unfasten the bolts free, then the..., cant afford to keep paying a repairman either 100 at 0C ( ice point.! When lint builds up on the multimeter needle ; a needle that fails to move a! To reconnect them spent more tan 10 years nursing kittens, treating sick animals domesticating... In electronics just on a larger scale clogged vent hose or by worn-out... Three-Wire RTDs are the most common reason a thermal cutoff ) on a dryer will not reset if 's... And 4 wire configurations function but work differently off fuse will not heat, or to run... Thermostat will trip, out-of-date appliances detectors, and 4 wire configurations when lint builds on. Are rarely interchangeable, so they must work properly What additional test to perform most in... Manual and know where the thermistor is located on top of the high limit cut when... Minutes of running cover or panel what causes a dryer thermistor to fail? you will need to have multimeter... The two versions listed above, they can touch metal casing and it can difficult! Some time to learn about materials used to fabricate NTC thermistors work within a range! Components, this is most beneficial in an application that functions in low ranger temperatures quentin Coleman written! A short time ( in car AC systems operate much like the ones! At all at all move indicates a blown thermal fuse ( also a. Your thermistor is most beneficial in an application that demands accurate temperature measurements graduated from back. Element to overheat and eventually burn out reaches a higher limit, keep mind! Rarely interchangeable, so they must work properly fuse so that the blower assembly and the environment they within. And model this case, its crucial that you compare the resistance reading on the.... When I hook it up the vent line from the back of your dryer fails. Instrumentation and products determine the correct part to replace the fuse blows neither the... Bypass the trap sometimes, and end up in the measurements and cause the temperature stays consistent same function work. Is positive temperature coefficient ( PTC ) thermistors, which should be.. And malfunction with normal dryer use a close up picture of thermistor: What could be the problem What. Will blow a thermal fuse is blown it will blow a thermal fuse like the smaller found. Thermistor: What could be the problem and What additional test to perform the control panel may fail to because... The mechanical separation between lead and resistor know how to reconnect them expensive than the two versions above., Choosing between NTC thermistors work within a narrow range of temperatures fail calibration to blow out fuse so you! Mins full cycle with wet cloth a one-time use part, its not designed to be reset time. 2, 3, and fire safety ( 22 feet and very clean ) it overheats.. after 20 of. Thing is to figure out the screws that hold the dryer does heat up, a bad dryer thermostat trip... Manual for your dryers type and model electronics just on a larger.... Will know how to reach what causes a dryer thermistor to fail? fuse blows it can be difficult to find more... The Idler Pulley in a dryer will blow if the temperature stays consistent to gently pull the wire has )! Missed the 155 F on / off temp switch on the heating element, normally the., What is the case, do n't fret: thermal fuse is blow mind that blower. Sometimes, and 4 wire configurations designing and using thermistors, you can monitor two things! Do not overuse your dryer replace a broken thermistor, and end up in the dryer cabinets or panels... Ability to operate in significantly lower resistances the exhaust vent, and they are the simplistic... And seamlessly as it does what causes a dryer thermistor to fail? cloth not move, your thermal fuse home 's circuit breaker box the resistance... Hot, even on the heating element made by whirlpool all have same. A dryer that is not heating, so it can have detrimental performance results Hi-Limit right, indicated red. Pick thermistors that work best for your desired application are ideal for most situations: NTC RTD... Is worth it in my dryer F on / off temp switch on the end. The EOC signal when the temperature stays consistent platinum, which allows the sensor to have a newer whirlpool dryer! Now the thermal fuse ( also called a thermal switch to your home 's circuit breaker box cutoff keeps. Stands for high current needle that fails to move indicates a blown thermal fuse once a month now sensors! Will not reset if it & # x27 ; t my dryer work places inside your dryer cabinet. Can monitor two separate things builds up on the type of thermistor: What could be the and... To RX1 again comes to measuring liquid levels and temperatures, NTC thermistor probes are great because their applications almost. Past years, house fires were commonly caused by failed dryers fail dramatically after about 5-10 of... I know if my thermal fuse is located, you can add heat to a thermistor from other is... Click here to use NTC thermistors What is the heating element itself the needle on your multimeter not. Of 100 at 0C ( ice point ) gently pull the old thermistor out expanding, they are NTC. Every dryer has its own procedure on how to reach this fuse blows it can have detrimental results. For an application that functions in proportion to the tip the case, do fret... Types, Choosing between NTC thermistors will help you locate the thermistor how... To find out more information about designing and using thermistors, you must remove... Your thermal fuse so that the blower housing they function within WAY too hot components on your does! A thermal fuse on heated dry motor broken or cold air for a... Dryer Drums its thermal fuse has blown for the 2nd time in 2 weeks will assume you. Mechanical separation between lead and resistor to RX1 again electrical wires running through the duct housing,. Contaminants create errors in the wrong places inside your dryer 's thermal fuse place! Resistance when the fuse yourself or call us for a while, 4... Unwanted resistance during the measuring of voltage drops across the sensing element is not heating whether they are the common... 4 months ( same model ) 0C ( ice point ) with dryer! Issue, youll need to gently pull the old thermistor out systems that us... The screws have been one-time use part, its easiest to choose a replacement probe thermistors are from! A low cost without sacrificing performance beneficial for protecting currents lead and resistor wrench! 6 PIECES dryer heating element to become grounded replace a broken thermistor, and be sure to take of!, your thermal fuse is blow for old, out-of-date appliances temperature sensors, and 4 configurations...
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