Question about GE WB27X1127 WB21X535 THERMO SW-TCO SENSE TEMP

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PVM1870SM3SS will not power up found burnt THERMO SW-TCO SENSE TEMP

Will the WB27X1127 stop my microwave from power up

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This part is a Cabinet fuse and will stop power to the control panel, works through L1. This open or fails when the microwave cabinet get too hot and it is protecting itself.
So yes to your question.

I hope this helps

Posted on Nov 28, 2013


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Posted on Jan 02, 2017

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SOURCE: WHat part number for this GW Microwave oven thermostat?

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.


It will tell you where each one is located and what it's called, and should have the part numbers.

Three of them should read normally closed and one should read open.

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

If you still need help, let us know.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Jul 05, 2009

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My GE JVM1540sp1ss microwave has no power after a power surge. How do I check if theres a fuse without unmounting

My video here will give you disassembly info.

There were two versions of this model made. I've uploaded both schematics.

Your oven should have a technical sheet (which has the appropriate schematic) hidden behind the grille or behind the controller.

You should check the continuity of the fuse (on the noise filter board), the "bottom TCO," the "MGT TCO" on or near the magnetron, and the "cavity TCO."

The first two can usually be checked without taking the oven down but the cavity TCO can only be accessed by removing the oven from the wall, then removing the outer cover.

Also look at the circuit board next to the small transformer for the varistor. If it's charred, burnt, or split, you will need circuit board repair, which I can do for you.

You can find your installation instructions here.

More questions? Contact me directly here.*

* always include the full model number and FCC ID number from the label on / in your microwave (or a clear photo of the tag)



Jan 28, 2018 | GE Microwave Ovens

2 Answers

Where do i locate the fuse

Although you have not mentioned the model/make, take a look at the video here for replacing a Thermal fuse. Microwave Won Work GE Microwave Thermal Fuse Replacement part WB27X1127

on traditional fuse see
How to Fix Microwave Oven Simple Fuse Replacement

Mar 08, 2016 | GE Microwave Ovens

1 Answer

GE Profie PVM1870Sm3SS Dead

Slight discoloration of the connections that you mentioned is not unusual. you are smart not to put that new fuse in because it is not cheap. Without using a VOM meter, you really cannot tell what the problem is. It is either the high voltage diode, the capacitor or the magnetron. Of course shorting the wires where the fuse goes would result in a catastrophic failure of one or more parts that might be more than the fuse.

Mar 10, 2014 | Microwave Ovens

1 Answer

Microwave VENT fan keeps running

I would say you replaced a good hood thermostat (or "TCO" / thermal cutout) with a new thermostat of the wrong type.
The oven cavity TCO and the magnetron TCO will read zero ohms continuity when tested.
They are "normally closed" devices.
But the hood vent exhaust fan's TCO is a "normally open" TCO or thermostat, so it should read open or "infinity" on a continuity check.
If the temperature under the microwave gets too high, the hood TCO opens, which turns on the vent fan until it cools back down.
I would bet that only your fuse was blown.

May 18, 2013 | Microwave Ovens

1 Answer

Microwave has no power

Besides the regular fuse your microwave has two thermal fuses - one is attached to the magnetron tube (called the magnetron Thermal Cut Off or TCO) and the cavity TCO (usually located under the air ducts on the left side of the microwave). If you have the wiring diagram (usually supplied with the microwave) you can find them there. Unfortunately the model number you provided is incomplete and I'm not able to find the wiring diagram for your microwave.

garden led light

May 21, 2012 | Microwave Ovens

1 Answer

My microwave shows an error that says c-5 what is it

That would be "CS", which means low current sense.

CS Current Sense

Current Sense - Indicates control is sensing low current
(Amp) draw. Check components which would allow unit
to run but produce no heat or low heat. Current sense
circuit is active only when using pre-programmed pads.
Time Entry feature will by-pass current sense circuit.
Red wire from cavity T.C.O. must be routed through
current sense loop on H.V. Board.
Possible Causes:
1. Interlock switch (contacts 2 & 3).
2. Open thermal cut-out (magnetron).
3. Open/loose wire.
4. Power relay.
5. H.V. Board.
6. Magnetron.
7. Diode.
8. Capacitor.
9. Transformer.

See the full service manual here.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Oct 01, 2010 | Amana RC17 Microwave Oven

2 Answers

Kenmore Ultra Wave Microwave has no power

after removing the cover of microwave chk for continuty of cavity thermostat usually calld TCO(thermal cut off). it is located on top of the cavity and circular in shape.usually neutral wire goes through this 2 control board and this TCO is for protection of cavity from overheating.if this tco is open.then replace it.usually this happens when u cook for 2 long.

Aug 15, 2009 | Goldstar MV-1515 Microwave Oven

1 Answer

Need to replace Thermostat or Thermal fuse

GE calls them TCOs or thermal cutouts.

There are three in this model and they can all be ordered here.

The reference numbers relate to the drawing here.


111 WB27X1127 TCO -BOTTOM

59 WB27X10195 TCO -CAVITY

104 WB27X10194 TCO - HOOD

101 WB27X10388 FUSE

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing. It usually shows relative component layout.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Aug 19, 2008 | Microwave Ovens

1 Answer

Where is the inline fuse you are talking about

Hi: there are two fuses in the upper right section of the box( near the power cord entry) but that may not be the problem. After spending a good deal of time messing with the fuses and finding them to be fine I searched the web and found that there seems to be a problem with these units blowing out their TCO. This is a safety that opens ( forever) if the cavity temp is too high.

May 09, 2008 | GE Advantium 120 Convection/Microwave Oven

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