Question about Microwave Ovens

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After having it on to say pop corn, after 4 minutes it goes dead. Then 2 hours later there are 2 letters that appear. Then it will work again. I have had it for 2 weeks and this has happened several times.

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  • Microwave Ovens Master
  • 9,098 Answers

I'll bet the letters are "PF", as in power failure, right?

If it is going dead, sounds like the magnetron is overheating and opening the thermostat.

This can be caused when the internal cooling fan is not running or by a magnetron that is failing.

When I say internal cooling fan, I do not mean the hood vent exhaust fan which you can turn on and off manually.

I'm instead talking about the internal fan which comes on automatically whenever you microwave.

It is vital that the cooling fan runs, or the magnetron will be destroyed.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

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.

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

Posted on Dec 02, 2008

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Posted on Jan 02, 2017

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2 Answers

Microwave doesn't popcorn all the way on popcorn seeting


Most M/W use an estimated setting based on ounces of corn. I've found that many do not tell you how much is in each bag. The bags usually have no size markings. Check the face of the box for something like "2 each 3 oz bags".
* Try to use a normal re-heat setting (at full power) and cook a bag using the a minute longer than the recommended setting. Listen to the popping sounds and stop the M/W when the pops slow to 3-4 seconds. (2-3 seconds with 'Kettle' corn) Note the time lapsed and this is your correct setting. You may try the popcorn menu to find a similar setting but really your best bet is to use the method above as it's the most accurate.
* Note; Old or stale corn will not all pop (it dries out as it gets older and there is not enough moisture in the kernnal to steam pop.)
* M/W varies from model to model and brand to brand. Only way to check is to try several settings to get the best results.
* Pop corn brands vary in quality. You will find the better name brands pop more.
* Once you find a good popping brand then stick to that size and brand. (unless they change it on you.)
* If your really stuck on getting every corn kern popped then go with an air popper. It won't come out of cooker till it pops.

Good movie, don't forget the goobers, milk duds, frosty...
Aloha, ukeboy57

May 28, 2018 | Microwave Ovens

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Microwave blew house outlet circuit breaker, what is wrong


you have a short it could be anything would need to be diagnosed and dont plug back in and try to use again potential fire hazard --compare replacement cost to repair cost

Sep 09, 2016 | Microwave Ovens

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Why does my microwave go dead when i bake potatoes 9 minutes, goes dead then comes back


The thermal cutout on either the magnetron or cavity might be opening. Sometimes these cutouts become defective and open at too low of a temperature. Or, you might have an air flow obstruction to the magnetron, or cooling fan problem.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_29ad5d1dd86564b0

Jun 24, 2016 | Microwave Ovens

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I need instructions for 10in. microwave browner


Only place I've found is here: CorningWare Browner Instructions

As these dishes were designed by Corning for a 650 watt over, you can recalculate preheat and cooking times for your oven with the following formula:

650/(your oven's wattage) x (listed preheat time or cook time)

For example, for a Corning MW-9 dish, they list 4 minutes maximum preheat time. I have a 1,580 watt oven. So 650/1580 = .41 x 4 minutes = 1.64 minutes and about a minute and a half preheat. (MAX).

Mar 09, 2014 | CorningWare Microwave Ovens

2 Answers

Shut's off after cooking popcorn, only popcorn, won't restart for 15 too30min.


Sounds like the magnetron is over heating. Try putting a 4 0z cup of water in the oven along side the popcorn bag. See if this helps. Usually, the oven only runs 2 to 2.5 minutes for a bag of popcorn. You may have to experiment with the slightly different cooking time...

Oct 29, 2013 | Magic Chef CMV1000B Microwave Oven

1 Answer

The oven has no power. The outlet is hot. The unit will power up intermittently, but as soon as you try to turn it on it loses all power.


This is a safety feature of the microwave. Unplug it and leave the door open for about 10 minutes and it should work again with no problems.
P.S. My kids overheat mine all the time making pop corn.

Mar 27, 2011 | Samsung SMH9187 Microwave Oven

1 Answer

Can't pop popcorn well


It's 850 Watts, 0.9 cu ft.

That's enough for popcorn, but a magnetron does lose power once it starts to age.

The figure I've heard is an average life expectancy of 2000 hours for a magnetron.

Two "Band-Aid" suggestions for better exposure and more even heating:

1. Place the popcorn bag on top of an upside-down paper plate.

2. Place the bag off-center instead of dead center. Placing food in the center of the turntable is not as efficient as placing it off-center.

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

Dec 12, 2008 | Welbilt MR95TW Microwave Oven

2 Answers

Magic Chef Microwave looses power when making popcorn


That does indeed sound like the mag is overheating and the thermostat is tripping, but it's probably not the steam.

Do you feel a good amount of air flowing through the vents?

If the cooling fan is not running or the air vents are blocked, that wil allow the magnetron to overheat.

If air flow is not a problem, then you may have a defective magnetron.

Assuming it's still under warranty, it would be best to let a Magic Chef-authorized servicer handle it.

For more help from Magic Chef / Ewave : http://www.mcappliance.com/ ; Contact page http://www.mcappliance.com/contactus/contactus.asp ; Order

parts https://www.mcappliance.com/orderpart

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Maytag MMV1153AAW microwave


I have the same problem with mine!!! I spent 58 dollars to have a 6 dollar diode replaced. Now 8 months later... same prob. Replaced again myself and working fine again. Just make sure you label the wires while working on it. I didn't and it cost me 2 new fuses! Hope this helps.

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