LG 3B73362F Micro Switch(primary) - AppliancePartsPros.com

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Part Number:	AP4437957
MFG Part Number:	3B73362F
Made by:	LG

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Microwave light and fan turns on when door is opened. I suspect a switch in the door is malfunctioning? Can you give advice on what switch (primary/secondary) I need? thanks!

Hans for Model Number kenmore microwave 721.66339

Answer Hello Hans. You will need to test the switches. NC to COM should read closed and NO to COM should read open. You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html

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LG over oven microwave. Fan starts when door is opened. Seems to work ok, just nervous about the fan coming on. Read that it could be a door switch?

Jay for Model Number LMV2063ST/01

Answer Jay, The secondary switch would be the most likely cause of the motor coming on when the door is open.

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All the functions of the Micro Wave work except it does not heat the food. The toaster works. Thanks.

Randy J for Model Number 2003 Kenmore Micro Wave & Toaster Model # 721.63293

Answer Hello Randy, The things that you would want to check would be the High voltage side of the microwave. Check continuity on the magnetron thermal fuse and the diode. If either are open then replace. Check the magnetron for resistance. .50 ohms would indicate a good reading and check to make sure magnetic is not broken. If broken or magnetron reads open then replace magnetron. Check to make sure that capacitor and transformer are good.

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Latest Questions

The light under the microwave that luminates the the stove doesn't work. The switch activates the light but light doesnt come on. Have taken bottom off microwave to expose wiring for light tested wires to see if there is power and got no reading. How do I get access to switch on outside panel that I push to activate light? Is that my issue?

Dave for Model Number lmv1630bb

Answer Hello Dave, The switch to activate the lights for the bottom of unit is incorporated into the control board and cannot be replaced individually. If there is no power to the lights then the control board ACM49437018 would be what would need to be replaced.

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The microwave light comes on, the timer runs down, but the tray doesn't rotate and the motor doesn't run. It was in the middle of a timed cook and it just stopped rotating and running, although the timer kept running down. Any ideas?

Lila for Model Number LG LRM1260SW

Answer Hello Lila, I would check the turntable motor 6549W1S017A to see if it is working. You might also make sure the turntable support ring 5889W1A003B is connected to the motor properly. Hope this helps!

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Is this sensor the likely culprit for the malfunction of having the microwave start up when the door is opened past the 70 degree point?

Wayne for Model Number LMVM2277st

Answer Hello Wayne. No, if you open the door and the unit starts, you have a bad door switch and will need to replace the door switch on the unit. You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html

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