Question about Westinghouse WST3504 Microwave Oven

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Maytag MMV5165BA Over The Range Microwave

After cooking several minutes, the unit shuts down entirely (microwave, hood, light and display) and it takes about 30 Minutes to come back on. For example we cooked two microwave dinners. The first dinner cooked fine, but the unit shut down just as the second was finishing. Is this an electrical circuit overheating (voltage drop in circuit is from about 122 to 113 volts when running)or a magnetron problem? Thanks Ole

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Re: Maytag MMV5165BA Over The Range Microwave

We had this problem. It was installed improperly - to recirculate instead of to vent.

Posted on Jun 29, 2008

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Re: Maytag MMV5165BA Over The Range Microwave

It's cutting out as a whole, which signifies the power is cutting out to it - probably a safety feature. Check your warranty on the unit and have it replaced, either way - I wouldn't feel safe using it. A microwave I once used did the same, and it eventually blew up with a cataclysmic bang.

Posted on Sep 07, 2007

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Maytag microwave suddenly stopped working, overheated, nothing was cooking.

It is more than likely the magnetron is fried, to replace fuse! unplug microwave oven, remove top, "several screws" look to the right to the keypad control board, look down to a printed circuit board, clipped fuse should be near by, pop it out and replace with same current rating, assemble before testing, "lethal voltages present"

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Maytag microwave overheated and shut off - Model #MMV5165BA

That is not good, the magnetron has gone, or the thermal fuse has failed, "protects the magnetron from overheating" There is a possibility the keypad control board was a affected.

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I have a Maytag microwave, model# MMV5165BA and it has no heat.Everything displays and vent works but no heat.Can you suggest anything before I toss it out?

If it operates as normal but items don't seem to get hot it probably is a Magnatron failure (microwave producer). More times than not the repair / replacement of a Magnatron these days is not worth the investment, especially if the microwave is 4 years old or older ! You should be able to replace your microwave with a similar featured microwave / hood for about $300 to $400. You might try a JVM1750DMWW by GE great micro/hood for about $300, includes one touch sensor cook capabilities,300 CFM vent fan,removable rack,option to turn the turntable on or off, 1000 watts of cooking power. Good luck !

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Exhaust fan runs continuously on Maytag microwave. Please help

> MMV5165BAB hood vent fan runs continuously

You probably have either a shorted base thermostat on the base of the chassis of the oven or a shorted fan relay on the control circuit board.

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.


At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

We have the service / repair manual for this model and have uploaded it to our site here for free download to help you.

The base thermostat (which I believe has thinner pink and yellow wires attached, but not thicker black wires) should read normally open. If it shows continuity (virtually zero ohms or shorted) then it is bad.

Otherwise, I would say you have a shorted fan relay on the control circuit board.

We regularly repair such control units for customers nationwide by mail for $39.95 postpaid in about a week or so with a one-year guarantee.

Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) for more information & help.

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

William E. Miller, AS-EET
Microwave Oven Control Panel Repair Nationwide

Jul 18, 2009 | Maytag MMV5165 Microwave Oven

1 Answer

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Your magnetron is overheating and tripping the thermostat, which interrupts power until it cools.

Since it's less than one year old, it should be fully covered under warranty. I'd suggest contacting the manufacturer to get it fixed free.

You can find your nearest Maytag-authorized servicer here.

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

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It could have been steam or humidity.

If this is an over the range model, be sure you always use the hood vent exhaust fan when you're cooking on the stove top.

Whether it's a counter top or over the range top, always be aware that the cooling fan is running when it's cooking.

When in doubt feel for air flow through the vents.

Good luck.

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It is possible that the magnatron is bad but hard to say on a no heat problem without checking all components. A lot of model give 5-7 yr warranty on that part.

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Sounds like a problem with a temperature sensor or humidity sensor.

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Assuming the entire power line from the breaker to the microwave cord is okay, it's almost certainly a bad connection on the circuit board of the control panel assembly. For reference, we repair these from all over the country for $32.50 postpaid.

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