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Customer Questions and Answers for Microwave Door Switch by Lg

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Manufacturer Part
4.89 (64)
By: Lg
Part Number: OEM13313880
Manufacturer Part Number: 3B73362F

The Microwave Door Switch is an OEM replacement part for LG countertop microwaves. It monitors the door position electrically to prevent unsafe oven operation if ajar. 

Symptoms of a bad door switch include:

  • Inability to start or pause a cooking cycle unless securely latched  
  • Error messages about the door being open
  • Inconsistent detection of open/closed door positions
  • Unreliable contact functioning after extended use

Causes involve normal wear of electrical contacts and internals through many open/close uses. Exposure to moisture intrusion from spills may potentially damage sensitive switch circuitry over time as well.

This genuine LG replacement switch is also compatible with Sears/Kenmore microwaves.

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Questions & Answers

For Lg Microwave Door Switch (Part Number: OEM13313880)

1 Answer

Raymond, The primary and secondary switches will be the top and bottom and will have 2 terminals on them. The monitor switch will be the 3 terminal and will go in the center.

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Kenneth for Model Number MH7140XFQ1

the unit just stopped after being turned on. A black out. No power no clock, light don't come on when door is open. I checked main breaker. ( good). I checked wall out let still have power. I got a new fuse. Took unit down from above range. removed cabinet cover. open panel to expose fuse. Replaced fuse. reset control panel. Plugged the unit in to test before mounting over range. Nothing . Still have no power. What to look at next? What to test with meter?

1 Answer

Hello Kenneth, unmount the microwave, remove the outer case and check the cavity thermostat for continuity, it is located on top toward the left middle has white/white wires going to it.If it tests closed then check for 120v at the control board terminals P9 white to P12 white for 120v if there then the control board failed.

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1 Answer

Tari, This issue would most likely be caused by a latch assembly issue and will want to check to see which part of the latch is faulty.

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2 Answers

Mickey, there are 3 micro switches located on the right side of the cabinet, You will need to check the operation of the switches, 2 will be in a normally open position, 1 will be normally closed.

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2 Answers

Mickey, In order to access the door switches on the unit you will need to remove the outer cabinet of the microwave. To do this there will be screws around the back and on the bottom of the microwave that will need to be removed then you can lift the cabinet off.

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1 Answer

David, You will want to remove the control panel and test the door switches on the unit. These will be the most likely cause for this type of issue.

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1 Answer

Peter, Based on the information provided this issue will most likely be caused by a faulty main control board on the microwave.

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1 Answer

Hello CB. No the monitor switch 3B73361E is different than the 2 primary switches 3B73362F. If your switch that is bad is different than the other 2, you will need to order the monitor switch. Thanks.

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