This is a high limit thermostat designed for use within various models of microwaves. The purpose of a high limit thermostat is to open the circuit of the appliance when the internal temperature reaches a certain threshold, to avoid becoming a safety hazard. If this thermostat fails or is damaged, it will cause your microwave to stop operating entirely. This is not to be confused with a thermal fuse, which is a one-time use component, whereas this high-limit thermostat resets once it drops back below operating temperatures. But if your microwave has repeatedly shut off, it is defective, or if the manufacturer recommends you replace it after it is triggered, it needs to be replaced immediately for safe operation. Consider inspecting your microwave for other component damage or factors that could lead to your microwave overheating, because that is what is causing this thermostat to be triggered. Replacing the high-limit thermostat will require a flathead and/or Philips-head screwdriver to remove the cover for the electronics of the microwave. First, you will want to unplug your microwave from the wall outlet and use your screwdriver to remove the side/top cover to give you access within it. Using your user manual, locate the thermostat within the main panel assembly and disconnect it from the wire harnesses, which may require a set of pliers. Here you can inspect it and any other components for visible burn damage. You can also test this thermostat for continuity with a multimeter, to see whether it is burnt out or perhaps defective. Install the new thermostat in place and reassemble your microwave, and you can now microwave safely.
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Troubleshooting
This part fixes the following symptoms:
Won’t turn on | No heat
This part works with the following products:
Microwave, Microwave Oven Combo.
This part works with the following products:
Samsung, Maytag, Jenn-Air, Kenmore.
Part# DE47-20034A replaces these:
AP4219754, DE47-20034A
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Joe B - March 26, 2020
Verified Purchase
Microwave
Received part as needed and installed ok. Microwave now working great !
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Richard B - December 17, 2019
Verified Purchase
Microwave repair
I wish my microwave was working. Received the part but must not have been the problem. Think it is possibly the door switch but didn't have time to check it out because we left for the winter. Will pursue it in the spring! Thanks. We do appreciate doing business with you!
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Donald
January 11, 2023
my bad thermostat is labelled KSD-40LC 70.
What is your part number to replace this?
For model number smh1713s
Hi Donald, thank you for asking. This thermostat, part number PS4226431, is the correct replacement for the part production number KSD-40LC 70. If you need help placing an order for it, please feel free to give us a call. We look forward to hearing from you!
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Cris
January 28, 2018
Is this the one with the black wires on the right or the one with the smaller red wires on the left?
For model number SMH1622S
Hello Cris,
Thanks for your question. We are not showing the wiring information online; however, this part should only be installed by a licensed technician as your microwave's parts can contain electrical charges even when the unit is unplugged.
I hope this helps.
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Joseph
March 17, 2018
My microwave does not power up as if it is unplugged. I have tested the power outlets and have 120v at the outlets. The microwave had never had any trouble before. Where to begin with troubleshooting?
For model number mmv5201dw00
Hello Joseph,
Thanks for your question. The following parts should only be installed or tested by a licensed technician, because your microwave can contain electrical charges even when unplugged. You will want the thermostat, capacitor, and door switch tested by the technician, and replaced if necessary.
I hope this helps.
My microwave popped and lost display, no lights, like theres no power. There is 120v on outlet.I tested the the two fuses on top. I tested the door switches and all are working. I tested the thermo on top it showed open. I checked the two thermos below display. The one on right showed open and the one on left showed closed (just as i read on line it should be). I am at a loss where to turn to now
For model number ME18H704SFS
Hi John, I would first trying to unplug the microwave for 10 seconds and plugging it back in. If you are sure the unit is receiving power and have checked all the fuses including the ceramic Fuse near the power cord. It could also be the door switch or door latch not properly functioning. Thank you for your question and good luck with your repair!
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John
February 1, 2023
Is this thermostat N.O. or N.C. ?
For model number SMH9151W
Hello John, Thank you for your inquiry. We show that this high limit thermostat is normally open. It should test around 0 ohms if you are testing it with a multimeter. We hope this helps.
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John
February 1, 2023
I asked previously if this thermostat was Normally open or normally closed. Your answer was confusing. You said it was normally open and should read near zero ohms. But a normally open switch should read OL (near infinite ohms) on a multi meter. So it cannot be both N.O and read near zero ohms. I think that it should be normally closed and read near zero ohms. Is that the case?
For model number SMH9151W
Hi John,
Thank you for your question. This thermostat is normally open at room temperature and closes when it gets hot. When testing this part with a multimeter, if you get a reading of 0 ohms, it has continuity. If the meter does not move or does not change significantly there is no continuity and it will need to be replaced. We hope this helps!
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Wendell
November 29, 2021
Cut out and won't restart
For model number MMV5207BAQ
Hello Wendell, Thank you for the question. If it cut out and will not start but still powers on, we suggest testing the Door Switches. The Switches can be tested with a Multimeter to see fi they are reading NO or NC. It will have a marking on the switch to what it should read. We hope this helps!
I have this model built in microwave 1100 watt. I have what appears to be a code SE on my display and the unit will not respond, but periodically sends out 3 beeps. None of the buttons function.
For model number SMH9207ST
Hi Jerome, thank you for writing in. Our research has found : Error code SE
This error indicates that the start button is stuck halfway down. Push the button again, until it's released, this may take a few attempts. We hope this helps.
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Will
October 8, 2019
What cause microwave to blow fuse every time it’s used
For model number Vmv1152cab
Hello Will, thank you for your question. A faulty Micro Switch or misaligned Door can cause the Fuse to blow. The replacement Micro Switch for your model is part number PS11741686. It is also possible that the Ventilation Motor may have failed causing overheating and damaging the Fuse. The replacement Ventilation Motor for your model is part number PS4223855. Good luck with your repair!
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Elaine
December 18, 2018
The screen reads 5e. Can’t press any buttons. I don’t know why
For model number MMV5165BA
Hi Elaine,
Thank you for your question. The SE error code refers to a system error as a result of a shorted touchpad membrane. You will need to replace the touchpad. I hope this helps. Thank you and have a great day!
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