See part 4002 in the diagram
( Grid squares measure 1x1 inch )
Micro Switch
$
7.82
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In Stock
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PartSelect Number PS3522738
Manufacturer Part Number 3B73362F
Manufactured by
LG
Product Description
Micro Switch Specifications
This microwave door switch provides power to the various components in the microwave when the door is in a closed position, and interrupts power when the door is open. This door switch is approximately 1 1/2 inches long, and has 2 metal prongs called terminals that extend from its body. If your microwave will not turn or heat properly, there could be an issue with the door switch. You can check the switch for continuity using a multi-meter. With the actuator button depressed, you should see continuity between these terminals. If there is no continuity the switch will need to be replaced.
NOTE: Before you begin this repair, first make sure your microwave is unplugged, and that your capacitor is discharged. A capacitor stores large amounts of electricity even when your microwave is unplugged.
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Troubleshooting
This part fixes the following symptoms:
No heat | Won’t turn on | Doesn’t shut off | Tray won’t turn
This part works with the following products:
Microwave, Microwave Oven Combo.
This part works with the following products:
LG, Kenmore, Whirlpool, General Electric.
Part# 3B73362F replaces these:
AP4437957, 3B73362E, 6600W1K001D, 6600W1K003C, 6600W1K004B, 6600W1K004C
Questions and Answers
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Michael
November 29, 2018
Where do i find the part number on the door switches? And will this solve a problem of no heat and no turntable?
For model number MH6150XMQ
Hi Michael,
Thank you for your question. The part number listed under your model number for the door interlock switch kit is PS373050. When your microwave turns on but does not heat up, it may mean the door switch is broken. The door switch signals other microwave components to supply power when closed, and to stop heating when open. The door switch can also be called an interlock switch. When this part doesn’t work, the fan and stirrer motors may still function, which makes your microwave look like it is working. If the microwave is not heating you also need to check the magnetron. I hope this helps. Thank you and have a great day!
13 people found this helpful.
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Tom
November 7, 2019
Will not shut off..light works and the oven heats up
For model number 40573116310
Hello Tom, thank you for your question. This is normally caused by a bad door or door switches in the unit. We would recommend replacing the door switches first, and if the issue persists, the board could be the issue. I hope this helps!
4 people found this helpful.
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KELLY
November 16, 2019
Everything works on my microwave , but it quit heating . Do you think that it can be fixed
For model number LMVM2277ST
Hi Kelly, we recommend replacing the micro switch PS3522738. Thank you for your question and good luck with your repair!
3 people found this helpful.
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Sharon
May 2, 2019
My microwave will run for 2-3 min. And shut off. Regardless of the time entered/
For model number 790.80333310
Hello Sharon, Thank you for the question. This sounds like an issue with the main PC Board, PartSelect Number PS9865010. I looked up the part and it is listed as No Longer Available/Discontinued. There is no part substitutions listed. My suggestion here would be to call the manufacturer and see if they can provide you with a substitution for these part numbers. Hope this helps!
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William
February 3, 2020
I need a replacement socket for the stove top light
For model number LMV1813ST
Hello and thank you for writing.
Can you please recheck your model number as it shows to be a microwave rather than a stovetop? If you were looking for the microwave light socket the part number would be PS3529342. We hope this helps. Please contact us anytime if you require further assistance.
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Bertha
November 6, 2019
I am looking for a mounting bracket for my above range microwave
For model number WMH32519CB1
Hello Bertha, Thank you for contacting us. I have researched the model you have provided and have found the part you are looking for is PartSelect Number PS12074431. Hope this helps!
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Jim
January 17, 2020
How to open the door to install the switche(s)
For model number 721.85033010
Hello and thank you for writing.
Remove the front control panel from the microwave. Locate Micro Switch,(on the left side connected with two snap-in wires). Pull out wires, pull out the switch. Replaced faulty switch with the new one. Snapp in two wires. Very easy. However, need a short 2" Philip screwdriver to be able to unscrew the screw holding the old switch. Attached front panel. Connected microwave back to power. We hope this helps. Please contact us anytime if you require further assistance.
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Margaret
January 21, 2020
Turntable turns when door is open.
For model number 721.80832500
Hello and thank you for writing.
It certainly sounds like it could be faulty switches PS3522738 and PS3529297, you should check the part(s) for signs of damage, and replace as necessary. It is recommended to replace both parts at the same time. We hope this helps. Please contact us anytime if you require further assistance.
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Cathy
December 2, 2019
Micro wave makes a deranging sort of sound occasionally and slips off the center turner device. L think that part needs to be replaced. Can you help me order the right part??
For model number 72185032111
Hi Cathy, thank you for your question. That would be your motor, this part here: PS3529217. Good luck with your repair.
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Tom
June 24, 2019
Our microwave door opening button is inoperable. The door latches are fine. The microwave functions normally except for the door opening button. Is this switch the correct replacement part to repair the door opening button?
For model number KCMS1555R
Hello Tom, Thank you for contacting us. I have researched the model you have provided and have found the push button is discontinued. I suggest checking the latch bracket, Part #: PS11745265 and the spring PartSelect Number PS11742286. The push button does not have a electrical switch to operate it. Hope this helps!
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Customer Repair Stories
Average Repair Rating: 3.9 / 5.0, 11 reviews.
What's this?
Search filter:
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Keep searches simple. Use keywords, e.g. "leaking", "pump", "broken" or "fit".
Sorry, we couldn't find any existing installation instruction that matched.
Microwave would not rotate or heat up food.
After watching a few youtube videos, I used a phillips SD to take controll pannel off to access the switches that sense when microwave door is closed. Swapped out all 3 switched and mocrowave works like new. $20 fix (shipping included)
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Joshua from WHITE LAKE, MI -
Difficulty Level:Very Easy -
Total Repair Time:15 - 30 mins -
Tools:Screw drivers -
32 of 39 people
found this instruction helpful.
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Broken door micro switch. (unit does not start heating)
Unplug the unit before servicing. Need phillips screwdriver. Open door. Use step ladder to access and remove 2 small screws from top of the room air diffuser at top of unit. Slide diffuser slightly to the left to align the diffuser's plastic tab on the left side to rotate toward you. (The wires for the front control panel are at the far left side of this difuser, but difuser is slotted for easy removal). Once the difuser is removed you will see 1 screw at the top that secures the pannel cover on the left side of the unit. Remove screw and slide this panel slightly up and out. This exposes the plastic frame that holds the upper and lower door switches. To locate the door switches and observe how they work, close and open the door and watch the door (bayonets) open and close the micro switches. Do the (red) buttons on top of the switches move up and down when the door bayonets push and release? If the buttons do not "pop" up when opened the switch is defective. The switch frame is secured with 2 screws. Remove screws and rotate the unit out for easy access to the micro switch(s). The internal (spring?) on my unit that is suposed to allow the red (visible) button on top of the switch to "pop" up when the door is opened was broken. Carefully pry the switch outward while being careful to lift the plastic holder-piece that holds the switch in place. Be careful, there is a small pin on the frame, so rotate the switch OUT toward you while lifting (carefully) the plastic holder-piece (you will see it on top of the switch). You can use an ohm meter to test the continuity of the switches. But if the buttons don't "pop" they are defective. Replace switch and reassemble.
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JAMES from BILLINGS, MT
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Difficulty Level:Very Easy
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Total Repair Time:30 - 60 mins
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Tools:Screw drivers
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Parts Used:3B73362F
18 of 24 people
found this instruction helpful.
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everything worked except it wouldnt cook
tested all 3 of the door switche for continuity, the top switch was faulty, replaced it,for approx $4.00 and saved a $350 dollar microwave.
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Joseph from N VERSAILLES, PA
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Difficulty Level:Very Easy
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Total Repair Time:30 - 60 mins
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Tools:Screw drivers
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Parts Used:3B73362F
8 of 14 people
found this instruction helpful.
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Door switch was burnt out
Removed outer cover
removed lower door switch
installed new switch
Wa La!
removed lower door switch
installed new switch
Wa La!
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Edward from ORCHARD PARK, NY
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Difficulty Level:Really Easy
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Total Repair Time:15 - 30 mins
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Tools:Nutdriver
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Parts Used:3B73362F
4 of 5 people
found this instruction helpful.
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When the MW door was opened a fan would start running. Close the door the fan would go off.
Removed the MW from the wall. Took the top screws off the air vent. Then removed the two screws holding on the display. I then moved the display to its side and it revealed the micro switches. I removed the plug in leads from the micro switch one at a time. I did this with all three micro switches only one at a time. I reinstalled everything and plugged it in. No more fans starting when the door is opened.
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vic from Allen, TX
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Difficulty Level:Easy
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Total Repair Time:15 - 30 mins
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Tools:Screw drivers
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3 of 3 people
found this instruction helpful.
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Microwave would not heat anything and turntable no longer turned.
I decided the door switch was the problem because 2 problems happened at the same time. I removed the 4 screws for the top outside cover and the 1 screw that held the control board. After removing the control board screw, I lifted it up and removed it. This gave me access to the 3 door switches. I then removed the 2 screws that held the plastic piece that holds the switches. This made it easier then to replace the switches.
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Jon from DANA, IN
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Difficulty Level:A Bit Difficult
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Total Repair Time:30 - 60 mins
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Tools:Pliers, Screw drivers
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3 of 4 people
found this instruction helpful.
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the turn table no turn and no heat the food. but the bottom oven worked
well I unplugged the microwave one day prior to working on it. shock precaution smart way to do this job. very easy pullout the screws behind the unit pull off the outer casing. minor screws inside the unit you have to remove a couple things out of the way. unplug the magnetron and remove first gives you more room to work on the side panel to replace the micro switches. I only replaced one the bottom micro switch. only one bad, but since I was in there I clean the bulb and changed the magnetron any ways. I read other reviews and made my choice to do so. it works perfectly now. Thanks PartSelect for having parts.
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mark from SANBORN, NY
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Difficulty Level:Really Easy
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Total Repair Time:15 - 30 mins
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Tools:Screw drivers
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2 of 2 people
found this instruction helpful.
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Oven would not start when closing door.
Removed some cosmetic panels. Removed the assembly with micro switches. Examined the faulty switch by checking the clicking action of switch. Two others were ok by this method. Replaced the switch with new one. Works fine so far. Thanks to web site and YouTube videos.
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Raymond from DEPEW, NY
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Difficulty Level:Easy
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Total Repair Time:Less than 15 mins
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Tools:Screw drivers
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Parts Used:3B73362F
2 of 2 people
found this instruction helpful.
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Microwave would not power up.
Fun and easy fix for my kids.
The countdown timer was working but no "cooking" happening. Did not hear the familiar sound of the heating part working.
Determined it might be some simple switches for under $15 dollars. Bought one of each. They allow the microwave to turn on/activate by signaling that the door is properly latched. My wife noticed that it was failing and then failed over the course of about a day. Several times where it worked, then did not work. The timer was counting down one time and then when she opened the door the microwave heating component turned on. Guess it had activated the switch as she was opening the door.
Procedure to repair
- Unplug
- Remove two screws on front top - allows you to remove the vent. Realized there was a charcoal filter there that I had never replaced so ordered that after the fix.
- Remove two screws to pull off the front right panel (area where your microwave buttons are) One at the top under the before mentioned vent and one under the microwave on the far right corner.
- Have someone hold the panel because wiring is to short to place it on a ledge while connected or take a picture and remove connections. I simply held it while my daughter undid the micro switches.
- Carefully remove micro switches. There were two "orange" button ones so I chose the top one to replace along with the green button one that I had ordered, so I simply pulled an orange from the bottom and a green from the top latch area. You may have remove the part that holds the switches since it was a little tough with the wires in the way and not knowing how the switches stay put.
- plug in new switches and place in the brackets that hold them in place
- reverse everything you did.
Viola - a working microwave vs purchasing a brand new for several hundred dollars or having to call in a technician.I love that my young kids did this project with me and we actually got it running. Don't like to have to throw away more items at the landfill.
Semi-Handy Man
The countdown timer was working but no "cooking" happening. Did not hear the familiar sound of the heating part working.
Determined it might be some simple switches for under $15 dollars. Bought one of each. They allow the microwave to turn on/activate by signaling that the door is properly latched. My wife noticed that it was failing and then failed over the course of about a day. Several times where it worked, then did not work. The timer was counting down one time and then when she opened the door the microwave heating component turned on. Guess it had activated the switch as she was opening the door.
Procedure to repair
- Unplug
- Remove two screws on front top - allows you to remove the vent. Realized there was a charcoal filter there that I had never replaced so ordered that after the fix.
- Remove two screws to pull off the front right panel (area where your microwave buttons are) One at the top under the before mentioned vent and one under the microwave on the far right corner.
- Have someone hold the panel because wiring is to short to place it on a ledge while connected or take a picture and remove connections. I simply held it while my daughter undid the micro switches.
- Carefully remove micro switches. There were two "orange" button ones so I chose the top one to replace along with the green button one that I had ordered, so I simply pulled an orange from the bottom and a green from the top latch area. You may have remove the part that holds the switches since it was a little tough with the wires in the way and not knowing how the switches stay put.
- plug in new switches and place in the brackets that hold them in place
- reverse everything you did.
Viola - a working microwave vs purchasing a brand new for several hundred dollars or having to call in a technician.I love that my young kids did this project with me and we actually got it running. Don't like to have to throw away more items at the landfill.
Semi-Handy Man
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Dusty from SNOWMASS VLG, CO
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Difficulty Level:Easy
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Total Repair Time:15 - 30 mins
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Tools:Screw drivers
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2 of 3 people
found this instruction helpful.
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not all control buttons worked, including button for the light under the microwave
1.Disconnected microwave from power 2.Put spring into middle round opening of the button compartment 3.Snapped in new button. So far 20 second job! 4. Removed front control panel from the microwave. Located Micro Switch,(on the left side connected with two snap-in wires).Pull out wires, pull out the switch. Replaced faulty switch with the new one. Snapped in two wires. Very easy. However, need short 2" philip screwdriver to be able to unscrew screw holding the old switch. Few minutes job! 5. Attached front panel. 6. Connected microwave back to power. Problems gone all work fine.
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LESTER from FOREST HILLS, NY
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Difficulty Level:Really Easy
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Total Repair Time:15 - 30 mins
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Tools:Screw drivers
-
2 of 4 people
found this instruction helpful.
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Customer Reviews
Filter By Rating:
Search filter:
Clear Filter
Your search term must have 3 or more characters.
Keep searches simple. Use keywords, e.g. "leaking", "pump", "broken" or "fit".
Sorry, we couldn't find any existing reviews that matched. Try using some different or simpler keywords.
Michael H - August 26, 2020
Easy repair part worked as expected
I could not locate the part using the microwave model number but this part came up at the beginning of the web site and it looked identical to the broken one I had so I took a chance and ordered it and it fit and worked fine and the microwave is working again.
Luis B - May 19, 2020
Great part
Easy fix
Bill M - October 7, 2019
Relatively easy repair.
Microwave would run with the door opened. Installed new switch and she is good to go!!!!
Darrell S - August 15, 2019
worked as expected
good service, good part.
Al D - April 25, 2019
Microwave Oven Repair
The micro switch arrived in good condition and worked perfectly. I was especially impressed with the rapid delivery. The extra charge for shipping was well worth it since the microwave was out-of-service for less than 24 hours.
Ray M - April 16, 2019
No luck
Never got it. Fedex is starting an investigation. They haven't even given me any feedback about anything yet. Its been 3+ weeks. Still can't use my microwave.
April 16, 2019
Hello Ray,
Thank you for leaving a review on the part ordered. I have sent you an email in regards to the order. Hope to hear from you!
Mark C - March 20, 2019
Easy Installation
Great parts, easy install...
Thank you!
Jerry S - March 12, 2019
worked as expected
replaced micro switches in a LG microwave. a little difficult to do on our model. Need a security star screw driver bit to remove the cover and also some difficulty to remove and reinstall the switch board. Results good, microwave works.
Fred E - February 5, 2019
Saved my MICROWAVE !
Was easy to find part that I needed on the website, placed order and received it promptly. This small part saved me the expense and labor of replacing the whole unit. Since it was malfunctioning when door opened I narrowed it down to one of two switches just inside the door.
Took about 2 minutes to install the new switch and now the unit operates as it should. A four dollar part was all that was needed. I now have partselect.com in my bookmarks.
Robert M - January 22, 2019
Micro switch
Perfect replacement, easy to replace.
Model Cross Reference
This part works with the following models:
PartSelect Number: PS3522738
Manufacturer Part Number: 3B73362F
Manufacturer Part Number: 3B73362F
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