Question about Microwave Ovens

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Bottom of microwave got too hot and cut out. replaced main fuse.still nothing.what is my next move ? do I replace the thermal cut out or is there a way to reset it? thanks.

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  • Microwave Ovens Master
  • 8,404 Answers

This is probably not the answer you are expecting and this may not be the trouble with your particular oven.

If you had nothing in the oven or if you usually cook just little things in the oven ... there is the possibility (remote) that the microwaves were reflected back into the generator and it cooked itself. While this repair can be made ... it is both expensive and dangerous. I don't recommend it for a novice.

If this happens to be a low end machine, it is not economically feasible to repair it with a generator costing probably 1/2 or more of the price of a new machine.

Thanks for your interest in FixYa.com

Posted on May 31, 2010

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Posted on Jan 02, 2017

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2 Answers

Panasonic Microwave NN-CT552W has no power - plug fuse ok - Has it got a thermal cut out or internal fuse? - Unit was ok after cooking some jacket potatoes


All microwaves has both internal thermal cut out and internal fuse, Yours problem sounds like an open 9 volts transformer that power up the front panel

Nov 07, 2014 | Microwave Ovens

1 Answer

Replace fuse


follow the next steps and fix it. use the VOM . God bless you

1. No power to outlet (overload or fault in microwave or other appliance).
2. Blown main fuse - likely due to other problems.
3. Open thermal protector or thermal fuse.
4. Defective controller or its power supply.
5. Clock needs to be set before other functions will operate (some models).f8629014-97b9-47e3-91bd-92cf0f66526b.gif

Jun 16, 2013 | Samsung SMH7178STD Microwave Oven

1 Answer

Samsung microwave quit working no power nothing


follow the next steps and fix it. Use the VOM. God bless you

1. No power to outlet (overload or fault in microwave or other appliance).
2. Blown main fuse - likely due to other problems.
3. Open thermal protector or thermal fuse.
4. Defective controller or its power supply.
5. Clock needs to be set before other functions will operate (some models).4683d79e-475c-49fd-bef9-58931f027352.gif

Jun 16, 2013 | Microwave Ovens

1 Answer

MICROWAVE PROPLEM


follow this next steps, use the VOM, and fix it. God bless you
1. No power to outlet (overload or fault in microwave or other appliance).
2. Blown main fuse - likely due to other problems.
3. Open thermal protector or thermal fuse.
4. Defective controller or its power supply.
5. Clock needs to be set before other functions will operate (some modelsbcd93e93-ccee-45ab-ba5c-70967b1ff19b.gif

Jun 11, 2013 | Sharp R-1874 Convection/Microwave Oven

1 Answer

Whirlpool over the counter microwave stopped working


SEE THE steps and fix it. and diagrams attached.use the DVOM.God bless you

Line Fuse


Every microwave oven has a line fuse. This fuse is designed to blow if too much current is drawn through the microwave circuitry. The fuse can be replaced, but the underlying issue should still be investigated and resolved. Otherwise the new fuse will blow also.
Main Control Board


If the microwave is not working the main control board may be defective. This is not common. When a microwave stops working the problem is usually the line fuse or within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.


Thermal Fuse


If the microwave is not working the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.
Thermoprotector


If the microwave is not working the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown2_6_2013_8_43_03_pm.gif2_6_2013_8_43_37_pm.jpg

Feb 06, 2013 | Microwave Ovens

1 Answer

My microwave shows nothing on display and will not turn on


see this causes and fix it. God bless you
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.

9_27_2012_10_33_27_pm.gif

Sep 27, 2012 | Maytag Appliances Over-the-Range Microwave...

1 Answer

Mh3184xpq-4 is dead, i have replaced the fuse...what else could it be?


see the next steps: use the common sense God bless you
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

8_1_2012_2_54_01_pm.gif8_1_2012_2_54_32_pm.jpg

Aug 01, 2012 | Whirlpool MH3184XP Microwave Oven

1 Answer

My M4155sp stopped working. No power at all (yes, I checked the power source). Replaced the fuse behind the keypad, - still nothing. Any suggestions?


please see the next step: God bless you
No Lights or Power, Unit seems Dead 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.
see the diagram attached.
7_27_2012_3_49_52_pm.jpg7_27_2012_3_50_23_pm.gif

Jul 26, 2012 | Whirlpool MT4155SP Microwave Oven

1 Answer

My Panasonic Microwave NN-T573SBBPQ cuts out after 3 seconds. what can I do? Or am I better of replacing it?


This sounds like a magnetron problem, if it gets to hot, there is a special thermal fuse that will open up if it senses abnormal temperature rise from the magnetron and after a cool down period it will reset itself. In rare cases I have known the thermal fuse to become defective and cut out prematurely. My feeling is replace the oven! because by the time you get a appliance repairman in for a sevice call and parts you probably could have bought a new microwave oven.

Jan 19, 2011 | Panasonic NN-T990SA Microwave Oven

1 Answer

Nothing turns on. replaced blown fuse.still nothing!


it could be a thermal fuse inside the unit or the thermal cutout on the mag tube isn't closing again after overheating, or possibly the triac or main power relay

Oct 06, 2009 | Daewoo KOR-1B4H Microwave Oven

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