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Maytag Microwave model MMV5165BAS. Doesn't heat

We have a Maytag Microwave model MMV5165BAS. When we attempt to cook something, the light comes on and the system seems to work, but it doesn't heat anything, it has a strange hum. Thoughts?

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HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))

Posted on Sep 10, 2009

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Posted on Jan 02, 2017

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Mmv5165bas vent fan will not stop running


Check to see if there's a relay providing power to the fan. If there is, the contacts might be sticking in the closed position. Assuming that this is an over-the-range unit, disconnecting the vent fan completely might not be a good idea as heat/steam from foods cooking on the range would more likely damage the microwave.

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

  1. Check the power diodeThis electronic component is responsible for transmitting current in one direction. If the diode becomes defective it will cause your microwave to not heat. Test the diode and replace it if necessary.
  2. High voltage capacitorResponsible for storing electricity, this part is a key component in any microwave. Remove, discharge, and test the capacitor to determine if it requires replacement.
  3. Damaged magnetronResponsible for generating waves and producing heat. When your microwave is no longer heating properly, replacement will be required.
  4. Thermal CutoffsExamine the thermal cutoffs on both the magnetron and the oven itself. Take off one of the leads and using a volt-ohm meter on RX1, check the terminals. If you get a result other than zero, replace the thermal cutoffs.

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Jun 17, 2013 | Microwave Ovens

1 Answer

Maytag microwave problem everything seemingly works but does not heat. Help


see this causes and fix it. God bless you
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

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Our Kenmore microwave oven recently stopped heating. The lights, turning plate and controls all work but with no cooking is occurring. The last time I attempted to heat something up I heard a cracking...


The most likely cause is a bad magnetron, "heats food" the other two possibilities are the high voltage capacitor and diode. The cost to repair will a approach a new microwave oven.

Apr 08, 2011 | Kenmore 80412 Microwave Oven

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Model mmv5165bas Door handle is broken - how do I replace the handle? Thanks JEFF


If your full model number (from the tag in or on the unit) is MMV5165BAs, then you'll have to replace the entire door.

If your model is one of these, the handle is available separately, with part numbers below:

MMV5165BAB14 or MMV5165BAB15 black part number W10189508

MMV5165BAS14 or MMV5165BAS15 stainless part number W10187840

MMV5165BAW15 or MMV5165BAW16 white part number W10189509

Normally you have to separate the door panels (as shown in the attached photo) and then you'll see the screws you need to remove.

Or you can watch a YouTube video (not a video I made) here that demonstrates how it's done.

You can find handy exploded views and order parts by model number here.

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

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1 Answer

We have just purchased a GE microwave oven, model JES1358WL. the light is on, the turntable turning, the control panel shows cooking and seconds counting down when attempting to heat cup of water. it is...


First: never attempt heating pure water in a microwave, that is dangerous.

Ensure the oven is not set to the minimum power, otherwise the heating will be minimal.

Try heating some food at maximum power for two or three minutes, if it does not heat, take it back to the shop.

About water in the microwave, see here:


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Microwaved Water - A MUST see

Superheating of water




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Do the inside light and turntable come on when you try to cook?

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

Do you have the model number?

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