Top Reasons Microwave Is Not Heating — Microwave Oven Troubleshooting

Find replacement microwave parts:

Visit our Microwave Repair Help for more troubleshooting information and repair videos:

Microwave not heating? This video provides information on how to troubleshoot a microwave oven and the most likely defective parts associated with this problem.

Commonly replaced microwave parts:

Turntable Motor
Touchpad
Control Board
Magnetron
Diode
Transformer
Fan Motor

Connect With Us!

Don't forget to like and comment on this video, and subscribe to our channel!

[alvaroadriano]

Thank you! After watching this, I will buy new microwave. :)

[davidshields]

I lost heat on my microwave yesterday, think simple before going for the more difficult solutions.
As with all electronic based equipment, do a power down reset by pulling the plug and reinserting again.
My machine came back to normal and save me getting a hernia carrying it to my workshop.
Should be #1 on the check list.

[willtrego]

Great video, thanks. My microwave stopped heating, but the lights, sounds, and spinning tray still worked. One of the three door switches had a high resistance so I replaced all 3 and fixed the issue.

[Maplie]

I was curious about how hard it would be to fix one without professional help. Thanks for the info and that disclaimer at the end. Probably a better idea to let professionals handle this if I want to repair one lol

[obijuankenobi]

Thanks to your video I now know my microwave has a flux I gotta get my microwave up to 88 mph.

[pizzanpepsi]

FYI I unplugged and plugged back in and now it works. You may want to do this first before starting your troubleshooting. I may have lucked out, or maybe more trouble to come, but at least for now its heating.

[ji]

Pressing Ctrl+Alt+Delete got my microwave working again 💪

[shanika]

1. Burned out diode
2. Defevtive door switch
3. Malfunctions and magnetron
4. Defective high voltage capacitor
5. Failed high voltage transformer
6. Blown thermometer fuse cavity fuse or thermiprotecter

In other words get a new microwave or become a maintenance man

[gmcbride]

GE 2.0 Countertop 9 years old. Sometimes heating. Now not heating. All my parts tested good. With further research I came across the Humidity Sensor connected to control panel and mounted to the side away from main components. This will stop the heating (magnetron) . I don't see testing info on Repair Clinic. eBay had the part $75. Replaced Microwave.

[West_Coast]

was it too hard to install a simple self diagnostic in the microwaves...

[joaquinfernandesgarcia]

1 - Burned-out diode
2 - Defective door switch (or switches)
3 - Malfunctioning magnetron
4 - Defective high voltage capacitor
5 - Failed high volatge transformer
6 - Blown thermal fuse, cavity fuse or thermoprotector
7 - Defective main control board

[charliecabrera]

I like how this video walks you through all the repairs first and THEN hits you with the disclaimer lmao

[moegasim]

Thank so much for this. Finally managed to fix my microwave. Was one of the switches.
Very helpful if you could mention the approximate readings for the capacitor, transformer, heat resistors and magnitron.

[igwekelechifebian]

Good day
Am febian from Nigeria, I have been following your channel for youtube, and I love you explicit pattern of teaching, pls I want to confirm, what is the value of the zener diode connected to the relay output in control circuit of a microwave oven

[agracer]

Just tested 1 thru 5 and they all seems to be ok. Microwave made a horrible screech noise and stopped heating. Is is possible the Magnatron will still have continuity as you showed and be bad? Just to be clear, there always no electrical smell and I found another video to test the transformer and it is OK. I could not find any thermal fuses anywhere. Any other suggestions?

[dianewacker]

One of the two thermal switches is a normally open (controls fan) and the other is a normally closed (runs microwave)

[autovale]

How about the Panasonic inverter Microwaves which have the integrated capacitor/transformer/diodes? Are you doing a video on those?

[hectorrivera]

About how much is the repair cost aprox, or better buy a new one, Thank you so much

[CENTAUR]

Symptoms: microwave has time, buttons work (except for #3) and functions almost as normal when entering cook time.
Once entering cook time, the number counts down.
But.. The turn table doesnt spin, the fan does not turn on, and the food does not warm up after it being counted down.

Prior to this, for the last several weeks the fan would turn on when opening the door, but it would still turn on when the door was closed and it was set to cook.. but that fixed itself and it started working fine.

What could it be? Fuse would mean the whole thing wouldnt work, right? the fact that most things work except for the fan, heat, and the turn table seems like it should be specific.

[james]

This was very helpful... Now I will fix my neighbors microwave 😃