Question about Microwave Ovens

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Sears microwave oven model number 564 8568511 When you plug it in the outlet it hums and the megitron tube comes on and it heats without seting time or power. It just hums and heats without the fan coming on

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  • Paul Hertel
    Paul Hertel May 11, 2010

    always done this?

    is it new?

    dangerous situation.

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  • Microwave Ovens Master
  • 9,030 Answers

This is probably a shorted triac or relay.

You can find exploded views and order parts by entering your model number at the Sears parts site.

There may also 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.

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

Posted on Nov 27, 2008

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Our 3 year old Sears Microwave makes all the noise as if it is working but heats nothing. What's the problem?

Posted on Aug 14, 2009

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1 Answer

Kenmore microwave recall


Call Sears and complain. Visit the Consumer product Safety Commission website. Between the two you should get all the info you need.

Jul 16, 2014 | Kenmore Elite Microwave, Model...

1 Answer

Turntable stopped turning one day last week. Will turn slowly without glass plate on spindle, but not with any weight. Is there a schematic for turntable drive somewhere?


If the oven is STILL heating, but the carousel isn't turning, this problem is commonly attributed to a turntable motor that has worn out and may need to be replaced. The motor is attached to the center plastic piece (called a turntable shaft, turntable ring or coupler) under the middle of the glass tray. The following link explains how to access and replace the motor:

http://www.fixya.com/support/r3555716-replacing_a_turntable_motor_on_a_microwa

This is a very simple repair, that usually is not expensive. The price will be determined by the model and manufacturer. This repair can also be performed on an over the range model microwave oven WITHOUT uninstalling it.

You can refer to any of the following websites for comparison:

searspartsdirect.com
pcappliancerepair.com
appliancepartspros.com
repairclinic.com

The first three sites listed have helpful exploded view diagrams to assist you with locating and properly identifying the part(s) you may need.

The average price for a motor is about $25 to $45. If your model number is not listed at all the sites, use the part numbers from the Sears site and use them for your search criteria. The model numbers don't always cross reference, but the part numbers do. The part number for a replacement turn table motor for the model you have listed is WB26X10038 (listed as item 43). If your model number does not cross reference to all websites, use the part number from the Sears website as your search criteria.


NOTE: Even though the carousel may not be turning, you can still use the microwave while awaiting parts. You will need to physically rotate whatever you are heating about midway through the cook time to ensure even heating. Early model microwave ovens were not equipped with a rotating carousel and this was the common procedure.

May 09, 2011 | Hotpoint RVM1425 Microwave Oven

1 Answer

Sharp Carousel Microwave Convection R-820JS. Oven gets hot but turntable does not rotate causing uneven baking.


If the oven is STILL heating, but the carousel isn't turning, this problem is commonly attributed to a turntable motor that has worn out and may need to be replaced. The motor is attached to the center plastic piece (called a turntable shaft, turntable ring or coupler) under the middle of the glass tray. The following link explains how to access and replace the motor:

http://www.fixya.com/support/r3555716-replacing_a_turntable_motor_on_a_microwa

This is a very simple repair, that usually is not expensive. The price will be determined by the model and manufacturer. This repair can also be performed on an over the range model microwave oven WITHOUT uninstalling it.

You can refer to any of the following websites for comparison:

searspartsdirect.com
pcappliancerepair.com
appliancepartspros.com
repairclinic.com

The first three sites listed have helpful exploded view diagrams to assist you with locating and properly identifying the part(s) you may need.

The average price for a motor is about $35 to $45. If your model number is not listed at all the sites, use the part numbers from the Sears site and use them for your search criteria. The model numbers don't always cross reference, but the part numbers do. The part number for a replacement turn table motor for the model you have listed is RMOTDA254WRZZ (listed as item 1-3 under the "Oven and Cabinet" parts section. If your model number does not cross reference to all websites, use the part number from the Sears website as your search criteria.


NOTE: Even though the carousel may not be turning, you can still use the microwave while awaiting parts. You will need to physically rotate whatever you are heating about midway through the cook time to ensure even heating. Early model microwave ovens were not equipped with a rotating carousel and this was the common procedure.

Apr 28, 2011 | Microwave Ovens

1 Answer

Our KitchenAid microwave works well, heats food, etc., but makes a constant loud and annoying humming noise (close in frequency and tone to the hum of cold fluorescent tubes) even when not in use. When...


hi it could be a bad neutral connection on your plug or inside on your high voltage transformer check the plug for burning and try plugging it in a different socket

Mar 17, 2011 | KitchenAid KHMS155LSS 1000 Watts Microwave...

1 Answer

GE microwave model number JVM230WV 001 popped while cooking now when turned on it will only make a humming noise. Light comes on but no heat.


Hi,


Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

Nov 14, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Mircowave runs but doesn't heat and it has a load hum.


You may need a new microwave..however, the diode may be defective or the magnatron tube may need replacing,,The magnatron tube is only warranted for 5 years so it may be used up as the model is (10years)fairly old.

Jun 18, 2010 | General Electric Microwave Oven

1 Answer

Everything works exept the heat. Thought we had a power surge a few days ago?


To allow us to help you effectively (at no charge), please post a NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, your symptoms, as well as the answers to these questions:

- When you try to microwave are the inside light, internal cooling fan and turntable all working?

- Is there any unusual noise or is it louder or quieter than normal?

(A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.)

We have a sound clip here of what a microwave should sound like when the cooling fan and high voltage section are working.

Note that a
full Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########

Nov 23, 2009 | Kenmore 80593 Microwave Oven

1 Answer

Microwave wont heat food. Everything else works.


Micorwave doesn't work when the megatron tube is out. That's probably why it won't heat up. Either replace microwave or the tube. You can get the number from Sears for the megatron tube by calling customer support.

Nov 09, 2009 | KitchenAid KHMS155LSS 1000 Watts Microwave...

1 Answer

Goldstar micro wave model number MVH1615WW


Could be the high voltage capacitor or the diode. Both can easily be checked with the proper ohm meter. It could also be the magnetron tube which you really cannot check. Bill

Mar 24, 2009 | Goldstar Microwave Ovens

1 Answer

Microwave is not heating. We have pulled plug several times to attempt to re-set it. This worked twice and now we have no use of our microwave.


if the microwave sounds like it is working but not heating, it could be a loose wire on the magnetron tube or the high voltage capacitor. if there is an abnormal low pitch hum, it could be a shorted capacitor, diode, or magnetron tube. Either way, diagnosis and repair is best made by a qualified servicer.
There are dangerous voltages present with all microwave ovens,
even when they are unplugged.

Mar 27, 2008 | Microwave Ovens

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