Question about General Electric Microwave Oven

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The base thermostat TCO on the GE microwave has zero ohms resistance and the hood thermostat TCO has infinite resistance. What are they supposed to be and which one is defective? Also, isn't the high voltage diode supposed to conduct electricity in only one direction like all diodes? The microwave high voltage diode also has infinite resistance in both directions on an ohmmeter scale of 100,000. Thankyou for any help.

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I am quite certain that both are fine in that case, if it was defective it would be higher than 0 but lower than infinite.... sounds like it may be something else causing the problem.... let me know what you find / think.

Thanks
Tim

Posted on Jul 17, 2009

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I would say you replaced a good hood thermostat (or "TCO" / thermal cutout) with a new thermostat of the wrong type.
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May 18, 2013 | Microwave Ovens

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I have GE Advantium 120 SCB1001 Microwave Oven. It is plugged in, outlet has power, but nothing comes on at all.


There are TCOs (thermal cutouts) which also can fail or blow, resulting in "no power" conditions.

All but one of them should be accessible without taking the oven from the wall.


At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.


The full service manual is here.

You can find helpful exploded views and order GE parts here.

BUT there is one TCO which has thinner wires of a color other than black or white. This is the hood TCO and should read "open" or "infinite" which is correct.

All other TCOs should read shorted or virtually zero ohms on a continuity test, as should the fuse.


The cavity TCO is only accessible by removing the oven from the wall, then taking off its outer cover.

When taking the oven from the wall, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

You can download GE owner's manuals and installation instructions here.


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

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Hotpoint rvm1435 microwave: seemingly no power (no lights work, no buttons work, etc); however a voltage tester shows electricity inside the unit. I tried replacing the fuse, but that was not it...any...


In addition to the fuse, the safety devices which will render the oven dead during a fault condition are the bottom TCO and the cavity TCO.

The TCOs (thermal cutouts) have thick black wires connected to them, and they should both read "closed" or zero ohms when you do a continuity check on them.

Do not confuse the hood TCO, which has thinner red and blue wires connected to it and which are supposed to normally read "open" or infinity. If the hood TCO were bad, the hood vent exhaust fan would run all the time.

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.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

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

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

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The service manual with installation instructions is here:
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You may have an open hood TCO (aka thermal cutout / thermostat). It should read normally zero ohms when measured.

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

But if you recently had trouble with your cooktop lights, the control circuit board may be damaged.

We regularly repair these control units for customers nationwide by mail for $39.95 postpaid with a one-year guarantee.

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In most cases these heat related problems are caused by a bad magentron. The magnetron is the main component of your high voltage network, and it is also one of the most expensive parts. Worst case scenario, you're looking at $110.

Now, YOUR microwave oven also has a thermal cut-out (TCO) on the magnetron (part number WB27X10166). It is designed to protect the magnetron and other internal components from an overheat condition by blowing like a fuse. It could be that your TCO is blown. A resistance check with the component removed should read zero ohms if good. Best case scenario if this part is bad is about $21 to replace.

You can view an exploded view diagram of your microwave oven at pcappliancerepair.com. I have already given you all the part numbers. The magnetron is listed as item 73. The TCO is item 77. I'm not guaranteeing these to be the cause of your problem, but I will tell you these parts fail the majority of the time.

So...I've given you some options to consider. I'm not sure how much a new microwave will cost, but it may be worth your while to repair this one (especially if the TCO is the only problem).

If you have any questions, please let me know. I hope this helps you.

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