Question about Maytag Microwave Ovens

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Microwave. I have a maytag microwave that doesn't heat anymore, everything else works fine.what can it be? thank you.

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SOUNDS LIKE THE TRANSFORMER OR THE MAGNETRON SAID BYE-BYE.WITHOUT A MODEL # ITS HARD TO SAY IF YOU CAN EVEN GET PARTS FOR IT.EITHER WAY IT WOULD PROBABLY BE CHEAPER TO BUY A NEW ONE.IF YOU CHOOSE THE LATER,BE SURE TO DISPOSE OF IT PROPERLY.

Posted on Nov 08, 2008

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You probably fried the magnetron.Unless you have a really high dollar microwave,you're probably better off replacing it.

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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.

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 testing.

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.

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.

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.


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Oct 01, 2012 | Maytag MMV4205 Microwave Oven

1 Answer

My microwave oven isn't heating my food. Everything else works, the fan, the lights and the keypad. The microwave turns and sounds like everything is working but the food won't get hot. We used it about an...


Usually when it doesn't het there is a problem with either the magnetron or one of the power tranistors. You would have to get a shop to tell you what the problem is as it can be a few things. If you have warrenty either maytags or from the store just find out from the store/maytag where the repair depot is. They will either repair or replace it. If no warrenty then don;t do anything without getting an estimate. It may be just as cheap to buy a new microwave.

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My Maytag microwave stopped heating. Everything


Generally the magnetron (the part that heats the food) is the cause if everything else still works. Unfortunately replacing the magnetron is barely cheaper than buying a new microwave though you can check out repairclinic.com to decide whether you want to attempt replacing the part.

Let me know how this works out for you.
Benjamin

May 24, 2010 | Maytag 2.0 Cu. Ft. Over-the-Range...

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I have the same microwave but it doesn't heat anymore


either your h.v. diode,h.v.capacitor, or the magnetron are faulty,the first 2 are reasonably priced, the mag can cost anywhere from $40 to $125

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Check out the door switch. Could be malfunctioning.

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If the microwave oven appears to be working but it is not heating the food, it is very possible that the magnetron, or its power supply has failed.

Jerry G.

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built in 3/94 is it worth fixing how much for magetron

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