Question about Frigidaire FMV145K Microwave Oven

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CFMV145--thermal Cutout Question

Hi, my OTR CFMV145 went completely dead, no lights, fan...nothing. The fuse, which I've replaced before is good, so I'm thinking its a thermal cutout (the fan vents were kind of neglected I admit). Its seems that the Hood thermal cutout (70/40C) is open when checked with a multimeter, but I've read that some TCO's are open normally, and close when activated. Anyway of telling this from a schematic? Since it's an expensive part ($80) I don't want to order a new one to find it is not the problem. It has two leads going in and one going out if that makes any difference.
Thanks.

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  • Frigidaire Master
  • 9,098 Answers

On this model, you can find the wiring diagram and exploded views at this site http://www3.sears.com (the 3 is correct)

In fact, the diagram you need most is here:
http://www3.sears.com/Paul/Leadimage.asp?productTypeID=0123245&brandID=1428&modelDesc=FRIGIDAIRE/MICROWAVE&modelNumber=CFMV145BC1&documentID=R0212007&documentTypeID=PLDM&documentClassCode=PV&titleType=WIRING%20SCHEMATIC&titleID=00006&

The hood TCO (normally open) has grey and red wires on it going to pins 7 & 5 of connector CO 02 on the circuit board.

The other TCOs should read normally closed.

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Jan 27, 2008

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Hi. my micromark MM60106 oven seems to be dead ,no red light, no heat ,no fan. power is getting to the switch but nothing works, do I need a new selector switch



Try using the VOM
First check is the main fuse of the unit. On countertop units, you will need to take the shell off. The fuse will be close to where the cord comes through into the unit. OTR units, this main fuse is usually behind the control panel or possibly behind the vent. Usually the fuse is obvious if blown, otherwise test with an OHM meter, if open, replace fuse.
Some brands will also have a thermal cut-off fuse in the incoming voltage line to the control board. Older Maytags and Samsungs have this fuse in it. This thermostat looking fuse is usually above the oven cavity somewhere under the outside shell. Sometimes you can get to it through the vent of OTR models. Test with an OHM meter, replace if open.
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Apr 02, 2013 | Microwave Ovens

1 Answer

Model nn-n765 Was running made a scrapping noise then shut down now completely dead won't start no lights nothing


A wild guess: the scraping noise was a motor bearing seizing up (fan or turntable). A thermal cutout blew when something overheated. This would have taken several minutes to happen.

Alternate, and more likely explanation: the scraping noise was actually high-voltage arcing in a failed component, most probably the voltage doubler capacitor. This would blow the fuse. Replace both the capacitor and diode; the diode was probably overloaded and could fail at any time if it hasn't already. At $5-$10, it's cheap insurance against having to fix the thing twice.

Jan 18, 2011 | Panasonic NN-H765 Microwave Oven

1 Answer

Yesterday, my sharp carousel r-1460 went dead. I took apart the front keypad and replaced the 20amp fuse behind it. the microwave light and fan work.But, when I start microwave to cook something, pop! fuse...


If the 20A fuse is blowing, it is often the high voltage transformer or magnetron. If this is the case, and the microwave is not under warranty, replace it. Residential microwaves are generally considered disposable. Parts and labor are just too expensive. A magntron or transformer can cost more that half the cost of a new microwave.

Feb 24, 2010 | Emerson MW8102SS 1100 Watts Microwave Oven

1 Answer

No Lights just turned off


Chances are the magnetron overheated and the blew the thermal cutout (TCO or thermal fuse), thus protecting the magnetron.

Bacon has a fairly low moisture level and when can cause overheating if there's no water load in the oven.

That said, a microwave can be dead for many reasons.

It may be the fuse, which is usually located on the floor of the oven behind the control panel or between the door switches.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

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.

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

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

Jul 27, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Sanyo microwave EM-S1065S stopped working completely


Does the inside light come on when the door is opened?

If not, then I'd say the internal fuse or thermal cutout / thermostat has failed.

A microwave can be dead for many reasons.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.

Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

We're happy to help and we appreciate your thoughtful rating of our answer.

Jun 03, 2008 | Microwave Ovens

1 Answer

Panasonic NN-P294SF dead


Yes, there will be a fuse and also on or above the magnetron, there will be a thermal cutout or thermostat, and one on the top of the cavity.

But here is our long answer on a dead microwave:

A microwave can be dead for many reasons.

If the fuse is good, it may be an open thermostat or thermal cutout / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open. Then when it cools, it closes the circuit and allows power through again.

When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.

If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

Please feel free to contact me directly if you need more help.

We're happy to help and we appreciate your thoughtful rating of our answer.

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

May 19, 2008 | Panasonic NN-P294SF Microwave Oven

1 Answer

Complete Shut-Down


I woulds first suspect a blown internal fuse or a thermal cutout on the magnetron in your case, but a microwave can be dead for many reasons.

If it goes dead for just a while during or after cooking then comes back on, the magnetron is probably overheating and causing the thermostat to open. When it cools, it closes the circuit and allows power on again.

If it's intermittent or random, it may be a bad connection, usually on the control board or fuse holder.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.

If you or a friend decide to look into it, we have critical safety information and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

Please write back with more details if you need further help.

We appreciate your thoughtful rating of our answer.

Nov 23, 2007 | GE Monogram ZE2160SF Convection /...

1 Answer

Frigidaire Microwave


Dead? You mean no power, no lights, no beeps, nothing?

It's most likely a blown thermostat / thermal cutout on the magentron, based on your info.

But if you can post the model number I may be able to steer you better.

More generic info:

A microwave can be dead for many reasons.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the thermostat to open. When it cools, it closes the circuit and allows power through again.

If it's intermittent or random, it may be a bad connection, usually on the control board or fuse holder.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.

If you or a friend decide to look into it, we have critical safety information and disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

Oct 28, 2007 | Microwave Ovens

2 Answers

Microwave completely shut off, including the display


check the diode and the cap they like to go bad.good luck

Apr 06, 2007 | GE Advantium 120 Convection/Microwave Oven

2 Answers

Microwave Oven completely dead


Check if there's a fuse on the front panel.i'f had it on other makes.replace fuse and it should be ok.

Feb 22, 2007 | Kenmore 62702 Microwave Oven

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