If you replace the fuse without fixing the cause, the problem will recur, and it might even cause a fire. Replace the thermostat also, it should be right there next to the fuse. A defective cycling thermostat can also cause the dryer to overheat if it doesn't turn off the heat at the proper temperature. On newer dryers, a blown thermal fuse may prevent the dryer from running at all. People tell us that they clean the filters, we often see a different story. Would it be the thermostat wp8557403? Its probably reading a little low, or intermittently failing, so the dryer is getting slightly hotter than is supported and the thermal fuse blows. Here's the thermistor for your model you can order if needed: One of the more common causes of the clothes dryer, not heating is that the Thermal Cut-off is faulty. The most common failure is an open circuit. Jim for Model Number 11068087701. If it heats the thermostat is the problem. My dryer gets too hot. A number of components inside the dryer can cause overheating. Usually, they do find anything wrong with the dryer components, or they are too damaged to test. Is your tumble dryer not heating up? Check the exhaust path for excessive lint or debris all the way to the exit point of the exhaust pipe. Would it be the thermostat wp8557403? A defective cycling thermostat can also cause the dryer to overheat if it doesn't turn off the heat at the proper temperature. Answer Jim, if there is not a gap in the vents or felts seals, the thermistor WP8577274 tested properly and there are no wires that are grounded out going to the element, then the failure would be in the main control WPW10111616. The thermal fuse is the most common cause when a dryer has no heat. Thermostats regulate the … The last of the common causes is that the Hi-Limit Thermostat is not … The most common failure is an open circuit. The leading cause of thermal fuse burnout is obstructed airflow. It failed the continuity test -- should it pass? You're especially likely to have clogged vents if your pipes are made with corrugated metal or worse, plastic. To tell for sure, you have to open up the dryer, but there are some things you can do first. A blown thermal fuse may be to blame. I also tested the high-limit thermostat at room temperature and it was closed, so I thought the logical assumption was that the thermostat was failing to open, which then caused the thermal cut-off fuse to fail. If it doesn't heat then the thermal cut-off and hi-limit can be checked the same way. To address this issue, remove the cover from your thermostat and gently clean its interior components—including the bimetallic coil and switch contact surfaces. The dryer’s thermal fuse is a non-resettable safety fuse that is designed to break electrical contact to the dryer’s burner if the dryer becomes too hot. Clear the vent restriction before replacing the thermostat to ensure that your dryer … I “think” I am entering the dryer into a diagnostic mode by depressing the more time and less time button then pressing the power button. Believe failure was caused by lint build up on the sensor and on the air rotor vanes. Fortunately, this is something that a homeowner can replace with some basic tools. The most important thing is to figure out the reason. Step 1: Make note of the current reading on your thermistor. Check the exhaust path for excessive lint or debris all the way to the exit point of the exhaust pipe. If the heater is shorted to the housing, it will cause the dryer to overheat. A dirty thermostat can cause erratic operation and sudden system failure. On newer dryers, a blown thermal fuse may prevent the dryer from running at all. The Tumble Dryer Filter. Most likely the fuse has blown and will need to be replaced to get your dryer up and running again. If this has failed the dryer will overheat and cause over temp thermostat to cutout. The dryer will not operate if there is a problem with the thermal thermostat, and may run for only short cycles if there is an issue with the cycling or high-limit thermostat. If this is true, you won't feel much air coming from the vent outlet. If it heats the thermostat is the problem. The fact that there is too much heat in the housing suggests the possibility that the blower, which pushes hot air through the exhaust, is broken. The dryer’s thermal fuse is a non-resettable safety fuse that is designed to break electrical contact to the dryer’s burner if the dryer becomes too hot. A faulty Thermostat can cause the temp to go too high. I tested the thermal cut-off fuse and found that it was open. You could also have a heating element that is shorted to the cabinet and heating constantly. Your dryer’s thermostat regulates the air’s temperature in the appliance and when this part malfunctions your dryer may not heat up. The timer, motor switch and … Do not let it continue to run and heat past this temperature. Thermistor faults Thermistors work in conjunction with the user potentiometer (boiler setting for temperature), and the Printed Circuit Board (PCB). This can happen as a result of improper handling, thermal mismatch, or heat damage. Based on you details the heater is Okay and not shorted to the heater housing. Wrinkled Clothes. If you've ever pulled clothes out only to find that they were still damp, or found that your dryer was not shutting off at the timer, the thermostat may be the first thing to troubleshoot. The leading cause of thermal fuse burnout is obstructed airflow. Since it only responds to temperature, its failure usually doesn't signify an electrical problem. If it has shorted, it may stay on even when the cycling thermostat turns it off. Also check the heating element to be sure it has continuity. This fuse is put in place to help prevent fires. These mechanisms rely on two other types of thermostats. – user9911 Jan 4 '13 at 19:14 You can also drop the thermal cutoff on the ground a few times to reset the inside diaphragm. Thermistors can be damaged or destroyed if temperatures fluctuate outside of the acceptable range. Another common reason thermistors fail is simply aging. Any obstruction to the rate of airflow will affect the operation of the dryer and almost certainly cause a failure of the thermostat or, the safety thermostat to trip. Check the thermistor with an Ohm meter, if it reads >50k Ohms (E1) or less than 500 Ohms (E2) it is defective. Believe failure was caused by lint build up on the sensor and on the air rotor vanes. These failures can arise because of mechanical separation between lead materials and resistor elements. References The dryer will not operate if there is a problem with the thermal thermostat, and may run for only short cycles if there is an issue with the cycling or high-limit thermostat. If the meter indicates very low or no resistance, the element is defective, and you should replace it. The thermal fuse is the most common cause when a dryer has no heat. They are basically fuses that react to excessive temperature -- not electrical current -- but they shut off electrical power when they blow. It’s meant to do this as a safety feature to prevent overheating but if the vent restriction is not corrected, repeated cycling of the high limit thermostat may cause it to fail such that it no longer prevents overheating. A visual inspection may reveal that it's touching some part of the assembly casing, but if not, you should unplug the dryer, remove the heater assembly and test it for continuity with an ohmmeter. The second most commonly experienced issue with thermistors is drifting in the resistance value. Codes: nE 8E8 UO1 d01 If the dryer heats up way past 150 degrees, then you will likely need to replace the operating thermostat that is right beside the thermal fuse. Repair or replace the dryer electronic control board. If you replace the fuse without fixing the cause, the problem will recur, and it might even cause a fire. If this has failed the dryer will overheat and cause over temp thermostat to cutout. You could also have a heating element that is shorted to the cabinet and heating constantly. The electronic control board governs the timing … The thermal fuse keeps your dryer from overheating. Over time, the thermistor circuit becomes less accurate and displays incorrect temperatures. This fuse is put in place to help prevent fires. The dryer will run for a few weeks or months, and high limit will fail again. 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