The internal-bias thermistor (Thermistor, Dryer Thermister, Dryer Thermistor) prevents the dryer from overheating by monitoring and controlling the temperature of the inside of the dryer drum. It is located on the blower housing, next to the thermal fuse. If your thermistor is defective, drying time could be prolonged or you could get a fault code. You could also notice your dryer overheating. You can test the outlet thermistor on a multimeter, it should read 10Kohms (10,000 ohms) of resistance at room temperature. It can tolerate 10% fluctuation. If your reading indicates the part is defective, it will need to be replaced. This model is white plastic. It is sold individually.
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★★★★★
★★★★★
Kevin B - March 23, 2025
Verified Purchase
Ordered two parts
Ordered this part and a heating coil. Both parts arrived on time and fit and function perfectly.
Thank you
★★★★★
★★★★★
Linda B - September 27, 2018
Verified Purchase
Easy repair!
Came fast worked great! Thanks
★★★★★
★★★★★
Gene E - June 17, 2019
Verified Purchase
Thermistor
Received part in a timely manner. Was in good condition and is now working great. Very satisfied with the service I received.
★★★★★
★★★★★
Stephen W - April 1, 2021
Verified Purchase
Fixed the perfect fit
The only problem I had was with the shipping company because they left it to get rained on and blow away on a windy rainy day. I found the package soaked in my neighbors garden. The part was well sealed and worked just like it should though
★★★★★
★★★★★
Walter J - April 4, 2021
Verified Purchase
It worked
It’s exactly what I needed and they made tracking the part easy and it works.
★★★★★
★★★★★
Walter P - December 12, 2018
Verified Purchase
Fit like a charm
Great price, easy fix.
★★★★★
★★★★★
Paul S - December 18, 2018
Verified Purchase
Dryer repair part
The service you provided was outstanding. I ordered the part on Thursday and received it Friday!! The dryer was back online doing laundry for the family. Your parts order processing and delivery options is where your strength lies. I normally buy from Sears partsdirect, but the best they could do is 7 business days and NO expedited shipping available!!! So, good bye Sears and hello partselect. Thank you. R, Paul
★★★★★
★★★★★
Richard F - October 22, 2018
Verified Purchase
Perfect part
The online video got me the right explanation of how to diagnose problem. Part was correct first time and saved me much $$ in repair bill.
★★★★★
★★★★★
Georges-Louis F - March 16, 2018
Verified Purchase
The parts arrived. Prompt service.
I cleaned all the dust from the interior of the dryer before arrival of the parts.The parts were installed and now the dryer which is 15 years old is now functioning like a new dryer. Thanks for your prompt service.
★★★★★
★★★★★
Richard H - July 1, 2018
Verified Purchase
Everything went as expected
The part came on time, and was exactly what I needed. Installation was easy and the part fixed the problem.
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Customer Repair Stories
Average Repair Rating: 3.0 / 5.0, 31 reviews.
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Dryer wouldn't Heat up. Otherwise all else worked
Thought I could do it myself. Bought most parts recommended by this site Took backoff thinking I could get to heating element. Noticed I would have to take out drum. Being in my 90's, decided to call repairman. He came and replaced the heating element I had purchased. He didn't have to come back after he had purchased parts.
... Read moreThat saved about half my bill. Worked Great!
Ordered $245 worth of parts for four possible fixes. None of the four fixes worked. Used an appliance repair person to do more troubleshooting. Fourteen days later and after spending an additional $380 ($625 total), a new control panel was installed. That solved the problem.
Start button failed to keep dryer running; no heat
Dryer is still in pieces after two weeks, dependent upon my time and ability to work on the project. I usually dry my clothes on an outside line, anyway. I especially appreciate Steve's videos demonstrating step-by-step procedures for disassembly, part installation, and reassembly. Very thorough. I timed each presentation---five minut
... Read morees for one, less than ten for the other. I watched the videos several times and took notes, so I would have the procedures in front of me while working on the unit at the other end of the house, I'm 77, forgetful. When I disassembled my unit, I noticed several rusted areas, so decided not to complete the project until I could get to the store for paint. As a primary care-giver for a severely dementiated 79-year Old Lady, I have to arrange for a relief to go shopping. That's why the machine is still in pieces. Got the paint, though, so back to work---eventually. When I disassembled the dryer, tucked away in the bottom was a very informative TECH SHEET, the discovery of which ticked me off that it wasn't provided with the owner's manual. At the bottom it says, "For Service Technicians' Use Only." In my house, I'm the "...Service Technician...," chief cook and bottle washer, launderer and litter box attendant.
Gas burner would heat for six or seven minutes, then shut down, and not cycle on again.
Unplugged electric power, removed lower front panel, removed fan unit cover. Was able to easily reach and test the disposable thermal fuse ok; m-coils ok but replaced; tested internal bias thermostat bad, replaced. Put fan unit cover on. Plugged dryer in to test and repair was successful. Did not install new igniter, flame sensor, or th
... Read moreermal cutoff fuse kit at this time but will keep for future if necessary. Parts.Select online help made it easy for me to do this repair. I bought all possible parts $170 w. ship given the dryer age. Three day delivery Denver to Phila. Before attempting to repair, called Kenmore service and. Was told one month before tech was available, unacceptable. Went to several appliance stores to buy new and found earliest available delivery would be 1 - 3 months! So went online to attempt repair. Found Parts Select which had numerous examples of exact problem and identified likely defective parts. So we avoided spending $1600 on a new dryer. The three installed parts were about $60! Highly recommend Parts Select.
Went to Kenmore website, got parts diagram, watched You Tube videos on dryer repair for this model, ordered parts. When parts arrived (in 4 days, great job!), re-watched You Tube videos, installed parts, dryer works great. Took longer than industry standards because I had to suction out/vacuum a great deal of lint/hair. as I went along.
Shutting off and had to wait before could turn back on
Followed online video very easy and dryer works like new one....
Allen from KENNETT, MO
Difficulty Level:
Really Easy
Total Repair Time:
30 - 60 mins
Tools:
Screw drivers, Socket set
2 of 2 peoplefound this instruction helpful.
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Dryer would run 1 min then stop running with some heat in drum
Videos are excellent to open and access internal parts. It turned out a rat was killed in the blower fan when we first encountered the problem. This prevented the blower from turning which interfered with motor function.
This required removing drum & belt, disconnecting motor clips, blower belt, and blower housing. The blower
... Read morehousing needed to be disassembled. Having a 5/16” & 1/8” ratcheting nut driver makes this process much easier. Don’t try this with a wrench.
After getting rid of the rat and decomposition, we sanitized the entire housing with soap & chlorine bleach.
Reassembly was uneventful and relatively easy. We ended up replacing 4 rollers, 2 belts (drum belt & blower belt), the thermistor which was damaged as a result of the blocked blower.
Message indicated something amiss in the motor circuit. Followed Instructions in the on-board manual. Turned out to be the internal-bias thermostat, and the exhaust air thermistor both. Changed faulty parts, cleaned lint from the system and we are off and running again. Thank You. DW Pranger
DW from ALVIN, TX
Difficulty Level:
Very Easy
Total Repair Time:
30 - 60 mins
Tools:
Nutdriver, Screw drivers
1 personfound this instruction helpful.
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Dryer won't start
Started by using the parts select troubleshooting guide. Didn't think that the drive belt could possibly be broken as the dryer wouldn't start. The non turning drum caused the "thermistor" to blow.
This repair looks intimidating but really is very easy.
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126 questions answered by our experts.
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Grace
November 25, 2017
Our dryer won't heat. We think it might be part 42 that is the issue, since every thing else is normal. What should the resistance be on the internal bias thermostat? We have 11.4 kilohms.
For model number MEDX500XW0
Hi Grace,
Thank you for your inquiry. The reading for the internal bias thermostat should read zero. If it is not zero then you will have to replace the thermostat. I hope this helps. Thank you and have a great day!
32 people found this helpful.
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CARL
January 5, 2018
When i push start button on my dryer it does not start but it beeps and says "sensing" got a diagnosis and fix for this?
For model number WED6400SB0
Hello Carl, Thank you for your inquiry. We would recommend checking the following parts to fix your issue: thermal cut out kit, internal bias thermostat, heating element, and main control board. You can test the parts with a multimeter. If you are unfamiliar with how a multimeter functions, there are YouTube videos available to assist you. Hope this helps!
25 people found this helpful.
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John
October 2, 2017
Have replaced thermal fuse-thermostat- and thermal cutoff.Checked vent lines.Moving ton of air.Does one load-clothes come out extremely hot and thermal fuse is out again.Any ideas?Thanks
For model number WED8300sw1
Hi John, Thank you for the question, I recommend replacing the Internal-Bias Thermostat,PartSelect Number PS11746740. This part controls the temperature of the inside of the dryer drum and prevents the dryer from overheating. Hope this helps!
24 people found this helpful.
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Shaun
September 29, 2017
My dryer has no heat, I have replaced the heating element and the thermal fuse, what else can I check or replace to fix the no heat problem?Everything else on the dryer works fine.
For model number WED7300XW0
Hi Shaun, Thank you for the question, I would recommend replacing the Internal-Bias Thermostat, PartSelect Number PS11746740.This part controls the temperature of the inside of the dryer drum and prevents the dryer from overheating.When defective you may not have heat inside the drum. Hope this helps!
13 people found this helpful.
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Todd
December 31, 2017
My dryer has no heat at all. What would you replace first? Heating element or thermal fuse...
For model number WDE9500TW3
Hello Todd, Thank you for your inquiry. I would try replacing both the thermal fuse and high limit thermostat first. Hope this helps!
9 people found this helpful.
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Ann-Marie
November 11, 2017
When your dryer won't start, how do you test to determine which part you need?
For model number MED6400TBO
Hi Ann-Marie,
Thank you for your inquiry. To verify what part is causing the issue, you will need to use a multimeter to check the continuity of each part. If you need help using one, there are videos on YouTube that you may reference. I hope this helps. Thank you and have a great day!
7 people found this helpful.
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JOHN
August 1, 2018
What should my ohm meter read when checking this part
For model number CED9050AW0
Hello John, thank you for your question. The bias thermostat should read around 10,000 ohms at room temperature. Good luck with your repair!
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Rick
December 6, 2017
I have a Maytag dryer model mgdx600xw0, i have no heat. I replaced the igniter assembly and sensor pt# wp338906. I still have no heat. Can you help me?
For model number MGDX600XW0
Hi Rick, Thank you for the question.Sounds like the 'M' Series New Style Coil Kit, PartSelect Number PS334310 needs to be replaced.When the igniter reaches a high enough temperature, these coils work together to let the gas enter the dryer. The coils open the gas valve; if the valve does not open the heating element will not ignite. Hope this helps!
Timing is off will dry for 10 min then jump to 48 min does not turn off
For model number Wed6600vwd
Hi Joan, Thank you for the question. This sounds like an issue with the control board, PartSelect Number: PS11748076. The timer is built into the board so the board will need to be replaced. Hope this helps!
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Art
August 16, 2017
Hello, with the timer set on towels the unit has started to add time to this default setting. Other settings the timer works correctly. Thank you
For model number WED7600XW0
Hi Art,
Thank you for your inquiry. That is a fairly tricky issue unfortunately. I would suggest testing your control board, this part, and your sensor as well. It could be that any one of these parts is causing that issue. I have listed those parts in two links below for you. If you find that they are all working fine, you might have to contact a repair technician to come and service your appliance. Good luck with your repair.
