Question about DCS CMO-24-SS Convection/Microwave Oven

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DCS-CMO24SS- no heat, replaced capacitor/diode at sears tech suggestion, replaced magnetron at this sites suggestion. I would suspect heater element first but read on this site turn table would not turn if element was bad. Turn table turns no heat in microwave nor convection mod. Help

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Posted on Jan 02, 2017

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SOURCE: DCS - CMO24SS - 900 Watt - Microwave not Heating

If all appears to be running as its working but just no heat. Could be issue with magnetron. You could also have loose connections to magnetron or somewhere in high voltaged as well.

Posted on Nov 25, 2009

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Can't get to heat anything can't seem to set clock first Hamilton beach model hbp90d23al any suggestions


Step 1:

see this steps and diagram and fix it. God bless you
Microwave Doesn't Heat

1)Diode




The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven. A regular meter with a diode checker will not work to check these diodes. You have to use a meter with a 9 volt battery or put a 9 volt battery in series with the diode to check it.

Door Switch




If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.

Magnetron




If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.



High Voltage Capacitor




If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testin

High Voltage Transformer




If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food. When a high voltage transformer fails it will usually arch and have a burning smell

Thermal Fuse




If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

Thermoprotector




If the microwave doesn't heat 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 blown.

Step 2:

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Feb 07, 2013 | Microwave Ovens

1 Answer

Sanyo EM-SL40S microwave everything seems to be working fine but food doesn't get hot?


see this causes and fix it. GOD BLESS YOU
Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.


High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.


Magnetron

A defective magnetron is the third possible cause of why your microwave is not heating, but you can hear a buzzing noise. Test your microwave's magnetron. Replace it if it is defective.


Thermoprotector If the microwave doesn't heat 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 blown.

Main Control Board If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.
High Voltage Transformer If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food.
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Oct 01, 2012 | Microwave Ovens

1 Answer

GE built-in Monogram Microwave Runs, but no heat


There are a few causes that would describe the problem you having, the first is a high voltage power diode that fails, the second is the high voltage capacitor that can open or short, the magnetron is the more likely suspect "heats the food" and finally the least likely will be the high voltage transformer that energizes the magnetron. I suggest a appliance repairman or tv technician for the job.

Jan 23, 2011 | Microwave Ovens

1 Answer

Microwave won't heat, light ,clock works the microwave just won't heat the items in it.


hELLO THERE
when a microwave quits heating but every thing else is ok normally
investigate these 4 areas

Investigate these three areas if your microwave won't heat but you hear a loud buzzing or humming noise:
microwave_diode.jpg Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.

picturena.gif High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.

microwave_magnetron.jpg Magnetron

A defective magnetron is the third possible cause of why your microwave is not heating, but you can hear a buzzing noise. Test your microwave's magnetron. Replace it if it is defective.

Nov 09, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

DCS - CMO24SS - 900 Watt - Microwave not Heating


If all appears to be running as its working but just no heat. Could be issue with magnetron. You could also have loose connections to magnetron or somewhere in high voltaged as well.

Nov 24, 2009 | DCS CMO-24-SS Convection/Microwave Oven

2 Answers

Microwave runs but doesn't heat


If there is no noise at all, this suggests that the power transformer isn`t receiving power from the timer/control panel. If you do hear a little buzz when you operate the microwave, The timer/control panel is operating, However It could be a few things which if you are confident enough to tackle, could be sorted by you but bear in mind that microwave ovens can store a lethal amount of voltage which can kill, about 2000 volts for a year or so. Possible causes of your fault are the Magnetron, Power transformer, Capacitor, Diode or even the control panel that provides power for the power transformer if you don`t hear the buzz. Have you got a meter?? Yes? Switch it to X10 ohms. Next, Unplug from the power socket and remove the casing, discharge the high voltage capacitor with a pair of well insulated snipe nosed pliers covered in a thick dry towel. Next, place the meter leads between the capacitor where the thick lead enters, and the casing of the oven. Does the meter read anything? No? You need to find out if the transformer is receiving power from the timer/control panel. If it is, the Magnetron will be US or the heater supply is missing to the magnetron. If the meter reads, The diode/capacitor or magnetron is short circuit. Disconnect the thick leads which are connected to the capacitor, Check for leakage across the capacitor again, Yes? Magnetron OK. Some diodes are built into the capacitor. On models where the diode is visible, (A black device going from the capacitor to a screw holding it to the casing), either unscrew the screw or disconnect the connector on the capacitor, now read the capacitor connector, if OK, no reading, Diode US, If there is a reading, the capacitor is US. If there`s still no reading, read the lead which you removed from the capacitor which goes to the Magnetron, If it reads, the Magnetron is Short Circuit. To check the heater, connect your meter across the two connectors on the magnetron, If it reads, the heaters are OK, read across the two wires that you revoved from the magnetron, if it reads, the Transformer is OK, if not, a new Transformer is reqiured. If not, they are O/C, New magnetron required. I hope this helps, Ian

Jun 09, 2009 | GE JVM1420 Microwave Oven

1 Answer

Microwave not heating, unit buzzing, strong ozone type smell


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.

With a smell present, I would not suspect the capacitor, but here are some links you or someone you know can use for test help, but read the safety warnings first:


http://www.gallawa.com/microtech/cap_test.html
http://www.gallawa.com/microtech/diode.html (if it is NOT shorted, it's probably fine)
http://www.gallawa.com/microtech/mag_test.html (continuity can be good even though it is bad!)
http://www.gallawa.com/microtech/xformer.html

I would most suspect the magnetron or transformer.

You can usually 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.

Nov 25, 2008 | Whirlpool RMC275PD Microwave Oven

2 Answers

Kenmore micriwave won't heat!


Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/diode.html (if it is NOT shorted, it's probably fine)
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

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.

Your biggest suspects will be a bad connection or relay on the control panel, a bad connection on the magnetron terminals, a bad magnetron, a shorted high voltage rectifier diode or a bad high voltage transformer.

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

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

You may be able to find better part prices than Sears here.

Your magnetron may have a 5-9 year warranty, so check your manual for that. Sears may send you a magnetron if it's bad and warranty.

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

Oct 20, 2008 | Kenmore 62702 Microwave Oven

1 Answer

Ge jes1358wk02 microwave... controls seem to operate correctly....fan runs... capacitor check ok as does magnetron... but no heat... possibly a little on some cycles... suspect problem is with...


When a high voltage fails, it shorts. Almost always. I've never seen one open, anyway.

If it's not shorted, it's probably okay.

Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part (such as a shorted diode)

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

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

Feb 29, 2008 | Microwave Ovens

5 Answers

GE JVM1870 Runs, but won't heat up


Our GE jvm1870 is now over 4 yrs old, and had been working fine-- until recently when using, didn't heat anymore & also started making a crazy sound.

Am no electrician, so I called GE to help. Needed a new magnetron & some diode. Part was under a 10 yr warranty- the total cost for service call + labor was under $200. Not great, but beats buying a new microwave ($400-700) and having to install it.

Apr 01, 2007 | GE JVM1870 Microwave Oven

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