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Customer Questions and Answers for Hi-Limit Thermostat by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM18045627
Manufacturer Part Number: WPW10116735

The Hi-Limit Thermostat is an OEM part for Whirlpool dryers. It serves as a safety device that prevents the dryer from overheating by cutting off the power to the heating element if the temperature exceeds a certain limit.

You should replace the hi-limit thermostat if it malfunctions or fails. Causes of a bad hi-limit thermostat can include normal wear and tear, exposure to excessively high temperatures, or electrical issues that affect its functionality.

Symptoms of a bad hi-limit thermostat include:

  • The dryer not heating properly
  • The dryer shutting off unexpectedly during a cycle
  • Long drying times or clothes not drying completely
  • The dryer becoming excessively hot to the touch

This OEM part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.

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Questions & Answers

For Whirlpool Hi-Limit Thermostat (Part Number: OEM18045627)

Mike for Model Number Amana Dryer Model #NED7200TW

My dryer was working fine and then just stopped heating during a load, (on Low). I turned it back on to try to dry them as best as possible with just fan. They never got warm at all. I put a second load in to try to do the same and those got REALLY hot! Dryer was set on Low setting. My wife said they were so hot she was afraid of fire. The dryer shut off on its on and had an HE code on the display. My original thought was bad heating element but that's obviously not it. I noticed their are 2 thermostats listed. I assume that one is a Hi limit, which in my case isn't working. Should I order both or can the Hi limit keep the element off? What's your thoughts on this problem? Thanks for any help you can provide!

1 Answer

Hello Tracy, This is most likely the thermal fuse WP40113801. It can also be the heating element WPY503978 or the high limit thermostat WPW10116735. These are bad to burn a wire so you should probably look for that. These are rather sensitive to excessive temperature, so it isn't a bad idea to check the exhaust ducting to prevent a repeat of the same issue. The exhaust is more important than most will give it. If the air flow is restricted the heat, lint, and moisture will simply blow past the felt seals, back into the cabinet with all of your heat and moisture sensitive electrical devices. The thermal fuse is just that........thermal. This means that it is opened by temperature. If it is open, which is what the issue most likely is, it was caused by the exhaust not allowing the heat, lint, and moisture to exit the unit. As per all of the manufacturers, flexible ducting is not recommended. It tends to get crimped and clogged too easily and causes customers to think that the dryer is "a piece of junk". In actuality, the most important part of the dryer isn't even part of the dryer. It's the exhaust duct! If you replace the thermal fuse without correcting the exhaust duct, the thermal fuse will most likely just blow again.

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Bob for Model Number ALE443RAW

My dryer appears to be running very hot, even at the lower temperature setting. I recently replaced the motor because the dryer would shut off when hot and eventualy the motor stopped working completely. The motor works fine now but the hot temperature issue still remains. I checked the vent from the filter to the vent flap and it is fine. I only have two elbows and 4 ft of hose to the outside and it is not kinked. 1. What should the dryer discarge temperature be? 2. What kind of resistance should I be reading on the hi limit thermostate, AP4298584? could it be anything else, thank you for your time!

1 Answer

Hello Bob. Test the temperature with a meter. It should rise to around 160°, then start coming down. If not, the cycling thermostat may need to be replaced on the unit.

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1 Answer

G, You forgot to attach a model number. but, in general, there other things to check or replace. With the new venting, and you're sure there are no kinks or restrictions and the vent hood is not too close to the ground or collapsed, you'll need to first check for and remove any lint build up in the air duct assembly and blower housing 37001141, check and make sure the blower wheel 56000 and vanes are clean, not cracked and the wheel fits tight on the motor shaft. and there are no air leaks around either drum seal, and blower inlet seal. This time, repalce both the thermal fuse WP40113801 and high limit switch WPW10116735 at the same time.

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1 Answer

Hi Mick. Start by replacing the timer part # WP37001251. Make sure your sensor bars below the lint screen inlet are scuffed off w/scotch brite pad. This will allow the clothes to pass over them and be sensed better. Make sure you have the proper 240 vac to the terminal block and 120 vac from each end leg(blk and red wire) to the center white wire (neutral) wire. Make sure the connections are tight. Make sure your temperature selector is positioned correctly part # WP37001164. Let us know if we can help further once these all have been checked. If the timer is sticking then you need to start there as it may just repair all. Thank You.

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1 Answer

Hello Thunder. The wire could have been damamged from a clogged or kinked vent assembly 37001148 is the wiring harness for the unit. Hope this helps.

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1 Answer

Hi Tony. In behind the control panel is a folded up wiring diagram. Remove power and remove the panel rear cover. The gray wire going to the thermal fuse, one side gray wire connects to the control board motor drive relay and the other feeds the motor overload itself. Thermal Fuse part # WP40113801. Make sure that you clean your entire vent system and the vent hood assy. outside. Thank You.

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1 Answer

Hi Shawn. The heating element can be shorted to ground and allowing half of the circuit (element) to stay engaged. This part # is WPY503978.It sounds like the venting system is clogged or kinked. You will need to check the vent and clean it out. Be sure and clean the vent pipe and the dryer air duct assembly. If the air flow is not good, the unit will retain moist air causing the clothes not to dry. Try running the unit with the vent unhooked from the back of the dryer and see if the dryer works properly. Hope this helps. Thank you.

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1 Answer

Hello Steve. If the dryer is overheating and shutting off, then it has to cool down before it turns on, you will need to replace the motor WP2200376. Hope this helps.

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1 Answer

Hello Wayne. Did you check and make sure the unit has 240 volts coming to it at the terminal block? If so, you will need to trace at the heater and see where your loosing voltage at. You could have a bad timer WP37001251 or motor WP2200376 on the dryer. Unplug the wires from the heater and see which one has 120 volts and which one does not. Trace the wire that does not have power and see where you are loosing it from. You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. Hope this helps.http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html

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