Question about Danby Designer Series DMW111KPSSDD

1 Answer

Microwave stops working when heating food

I tried cooking a sweet potato in the microwave and it completely shut down after a few minutes. After about 3-5 minutes the microwave will beep and will have power again. Have to reset the clock at this point. Tonight tried reheating lasagne. First piece was fine, second piece microwave shut down. Any ideas?

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  • Danby Master
  • 9,047 Answers

Foods that are low in density or low in moisture (such as bacon and popcorn, respectively) can cause the magnetron to overheat.

That's because there is not enough of either mass or moisture to absorb enough of the microwave energy put out by the oven.

The excess energy then reflects back to the magnetron and causes a standing wave (like a poorly tuned transmitter antenna) and causes the magnetron to overload and overheat.

When the mag gets too hot, it trips the magnetron thermostat, a protective device which rests when it cools.

If this overheating is a persistent problem, a stopgap is to put about 1/3 to 1/2 a cup of water in a microwave-safe container (a Pyrex measuring cup is ideal) in a REAR CORNER of the microwave whenever you cook such items. This will help absorb excess energy, but you may have to increase cooking time just a little.

And of course I always suggest that food items be placed off-center in the microwave, NOT in the center of the turntable, otherwise the food is not exposed evenly enough to the microwave energy and will not heat as efficiently as it could.

(Placing it in the center is sort of like stirring paint by twirling a stick in the center instead of pulling it around in a circle in the paint can).

Such inefficient heating wastes the energy at best, and at worst it puts a strain on the magnetron.

If a magnetron is repeatedly subjected to such stress, it will prematurely fail. It will also draw excessive current, which can strain the high-voltage transformer.

That in turn will often lead to the oven's drawing excessive current, resulting in a hot cord and plug, and the fuse will blow - hopefully before the transformer or magnetron does!

An overheating magnetron can be due to:

  • operating oven without cover(s) in place
  • wrong magnetron installed in oven
  • an old or otherwise failing magnetron
  • cracked magnetron magnet
  • improper power line voltage (should be 110-125VAC)
  • foods low in moisture (popcorn & bacon, e.g. - add 1/2 cup of water in rear oven)
  • failed or inoperable cooling fan or hood vent exhaust fan
  • deteriorating foam weatherstripping seals in air ducts or on outside cover
  • blocked air vents (dust, animal nest debris, insufficient free air space behind & around oven, etc.)
  • clogged or greasy charcoal filter or grease filter
  • blocked duct in hood vent exhaust

Posted on Jan 09, 2013

Testimonial: "Thank you for the information. It makes perfect sense. We just got it for Christmas so was a bit surprised when it stopped working for a few minutes.I will let you know how we make out with it the next time I plan on using it a fair amount."

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9047 Answers

SOURCE: Dandy Designer 800 Watt Microwave

I would suggest that you try it for a minute or so on the very lowest power level and see if it shuts off. If so, please post again with more detail about how it fails, such as whether it loses all power as if someone unplugged it or just acts as if someone hit the STOP button.

Posted on Apr 16, 2007

SOURCE: Danby Designer microwave (with exhaust

Its a bad magnetron

Posted on Jul 18, 2008

  • 2 Answers

SOURCE: Damage to samll rectangular material inside microwave

Well, I have just spoken with a reputable, but now retired, appliance repairman, he advised that this small rectangular cover on the upper interior of the microwave is a MICA Insulator Shield - of which one may be able to purchase just the shield. At this time, I do not know if any appliance parts places have this MICA Insulator Shield available for purchase. But apparently you can purchase a pice just slightly larger and cut the right size for replacement.

If the old one is burnt at all, or has a hole or crack in it - Do Not Use the Microwave.... as it will begin to arc and likely through out the breaker and/or fry the magnatron.

Posted on Jan 06, 2009

localwonder
  • 6784 Answers

SOURCE: Not working

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 Aug 08, 2009

carputers
  • 255 Answers

SOURCE: my microwave keeps beeping several times and i put

it junk replace it befor it burns u house down

Posted on Sep 07, 2009

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