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3522738-1-S-LG-3B73362F-Switch,Micro https://www.partselect.com/Schematics/LG/107333-4.gif


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PartSelect Number PS3522738
Manufacturer Part Number 3B73362F
Manufactured by LG

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.

This part works with the following brands: Kenmore, LG.

This part works with the following products: Microwave, Microwave Oven Combo.

This part fixes the following symptoms:

  • No heat.
  • Won’t turn on.

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Installation Instructions Provided by PartSelect customers like you.

Average Repair Rating: 4.3 / 5.0, 1 reviews What's this?
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6 of 10 people found this instruction helpful

Parts Used:
  • Switch,Micro
Level of Difficulty: Very Easy
Time to do repair: 30 - 60 mins
Tools: Screw drivers
Customer: JAMES from BILLINGS, MT

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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Model Cross Reference

This part works with the following models:

PartSelect Number: PS3522738
Manufacturer Part Number: 3B73362F
Brand Model Number Description