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Brand: GE
Model Number:JVM6175sf1ss
Main Symptom: powers off
What happens & when: powers off after short use then comes back on after a few min.
Error Code (if any): none
Parts or tests already tried: none
Photos / video link: none
There is power at the outlet when the microwave has none, everything goes out, no lights… We are not using it for long periods just warming up things, a few minutes max. then after a few minutes it just comes back to life? It must be a resettable fuse or relay. Any ideas?
Is the microwave mounted in a cabinet or freestanding? I had an issue once with a microwave that was in a hutch and if you pushed it too far in it would shut off after a minute or so then come back on after a few minutes. It was an airflow issue it was overheating
It’s a over the range with a hood vent. I checked the vents and they are all clear?
For GE JVM6175SF1SS, the fact that the microwave completely powers off after running briefly, then comes back on by itself after a few minutes strongly points to a thermal protector opening from excessive heat, then resetting after it cools.
This model has both a cavity thermal cutoff WB27X11094 and a magnetron thermal protector WB27X11095.
Pay attention to exactly what goes dead when it fails.
If the display, interior light, fan, and everything else shut completely off, and then power returns several minutes later without unplugging it, I would concentrate on the thermal protection circuit rather than the control board.
The bigger question is why it’s overheating.
Unplug the microwave first. Microwave high-voltage components can retain a dangerous charge even after it is unplugged. I would not probe the high-voltage section live.
With the unit unplugged and after the protector has cooled, disconnect at least one wire from the thermostat/TCO and check across its terminals with your meter.
You should generally find continuity/very low resistance across the normally closed safety protector at room temperature. If you can catch the microwave while it is in its “dead” condition and the protector reads OL/open, then it returns to continuity after several minutes of cooling, you’ve found what’s interrupting the power.
For this model I’d specifically inspect/test:
If it only loses power when the door is opened/closed, rather than after several minutes of cooking, I’d move the door switches/latch assembly much higher on the list. This model uses multiple interlock switches, including WB24X829/WB24X830.
But with “runs for a short time → completely dead → comes back several minutes later,” my first suspicion is the magnetron thermal protector tripping, possibly because of a weak/non-running cooling fan or an overheating magnetron.
If you tell me about how many seconds/minutes it runs before shutting off and whether the entire display goes blank, I can narrow down which protector I’d test first.
Thank you for the quick reply! Here is what I did after reading your great information. I run it for ten minutes to see if it would shut off but it worked fine and we usually only use it for a few minutes at a time. There is air coming out of the top front vent but I’ve never checked the flow before so I’m not sure if it’s lower than it should be. Here is the weirdest thing, it hasn’t ever gone off while cooking, but sometimes right after. When it goes off everything is off, no lights on the panel or when I open the door. I plugged a fan into the same outlet to make sure that when it goes off that I still had power at the outlet so I know it’s not the circuit breaker. I agree it’s acting like a thermal protector that’s resetting but can I even test a thermal protector if it’s not tripped.
Thanks for your help
For the GE JVM6175SF1SS, here’s how I’d test the thermal protectors, including both the basic continuity test and a temperature test. Since your microwave shuts completely off after a short time and then comes back on after cooling, the hot-temperature test is especially useful.
Microwave safety: Unplug the microwave before removing the cabinet. The high-voltage capacitor can retain a lethal charge even after the microwave is unplugged. Avoid the capacitor, magnetron, transformer, and high-voltage wiring unless the capacitor has been properly discharged.
The main devices to check include:
| Device | Part | Cold condition |
|---|---|---|
| Cavity TCO | WB27X11094 | Normally closed |
| Magnetron TCO | WB27X11095 | Normally closed |
| Hood/Vent thermostat | WB27X709 | Normally open |
With the microwave unplugged and completely cool:
For the cavity and magnetron TCOs, you should get approximately 0–1 Ω or a continuity beep.
If either normally closed TCO is open when the microwave is completely cool, it is suspect.
This is the test I’d concentrate on for your particular problem.
Put a large microwave-safe container of water in the microwave and operate it. Never run a microwave empty.
Run it until the microwave shuts completely off.
As soon as it shuts down:
If you now get OL, the magnetron TCO has opened.
Leave the meter connected while the microwave cools. If it eventually changes from:
OL → approximately 0 Ω
the protector is resetting as it cools.
If that happens at about the same time the microwave normally comes back to life, you’ve found what’s interrupting power.
You can take this a step further and determine what temperature the protector is reaching when it opens.
A thermocouple/contact temperature probe is preferable. An infrared thermometer can be used, but shiny metal surfaces can cause inaccurate IR readings.
Position the temperature probe against the metal surface right next to the thermal protector. Don’t place it across electrical terminals.
Monitor the temperature while heating the microwave.
Record:
Temperature when continuity opens → TCO opening temperature
Then allow it to cool and record:
Temperature when continuity returns → TCO reset temperature
Do not bypass or jumper the thermal protector to perform this test.
The WB27X709 hood thermostat works differently. It is normally open when cool and closes when it gets hot.
At room temperature:
OL = normal
To temperature-test it:
It should change from:
OL → continuity
when its closing temperature is reached. The WB27X709 is commonly specified at approximately 158°F for closing.
Allow it to cool and verify that it eventually opens again.
With your symptom of the JVM6175SF1SS shutting completely off after a short period, remaining dead for several minutes, and then coming back on, I’d concentrate first on the magnetron TCO WB27X11095.
Do the test cold, then repeat it immediately after the microwave shuts down.
If you find:
Cold: 0 Ω
Immediately after shutdown: OL
After several minutes cooling: 0 Ω again
then the magnetron thermal protector is definitely opening during operation.
However, don’t automatically replace the protector. It may be doing exactly what it’s supposed to do because the magnetron is overheating. Check the cooling fan, fan airflow, blocked air passages/ducting, and magnetron overheating before condemning the TCO itself.