Question about KitchenAid KHMS2050SSS Microwave Oven

1 Answer

Micro not heating.

Found and replaced bad monitor door switch. still nothing. Get a buzz every 2 seconds or so as if the magnetron is trying to engage; but then it kicks out. Any ideas? Haven't checked mag yet but i'm suspecting it. Found 0 Ohms on the mag. No shorts to housing. Will replace and hope there are no other problems. Checked another magnetron. Got 0 ohms as well. Got a known good invertor to try. Same problem. Just get a slight faint buzz for a split second every two seconds as if is trying to start but doesn't. Without any schematics or manuals it is going to get difficult.

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The magnetron is supposed to read nearly zero ohms across the two terminals. You are measuring the resistance of the filiament/heater/cathode of the tube. Activity in the magnetron occurs when the heated electrons are emitted from the cathode, pass through the magnetic field, swirl about, bounce in and out of indentations (vanes) in the tube, and finally land on the plate (antenna). The resistance from the cathode to the plate should be infinite. If not, you probably have a bad tube. Or, if there is continuity between the heater and the case, then you have a shorted tube.

What eventually happens to most vacuum tubes is that the cathode (filiament in this case) becomes coated with a material which inhibits the launching of electrons into the tube. When the flow becomes too low, oscillation ceases, and you have no microwave output. Sometimes they reach the threshold, but do no cross over quickly. Then you have a magnetron that is intermittent for a while.

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

Posted on May 19, 2016

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4 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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MicrowaveSvc

William Miller

  • 9179 Answers

SOURCE: Hello,i have microwave KHHS179LSS-2. Display

From a similar model's tech sheet (and yours should have one hidden inside):

F7
Power to magnetron interrupted
1. Unplug microwave oven or disconnect power.
2. After 40 seconds, check to see whether this solves the problem.
3. Check resistance of the magnetron thermostat.
4. Check the magnetron. See this file for details.
5. Check wiring to the 1100W inverter and control system. See "Checking Inverters"
6. Check operation of all interlock switches. See this text file. Check door, hinge and cavity front alignment. Adjust as needed.
7. If switches operate correctly, replace 1100W inverter.
8. If problem persists, replace electronic control.
9. Plug in microwave oven or reconnect power.

You can find helpful exploded view diagrams and order parts by entering your full model number (KHHS179LSS2 without dashes or spaces) from the tag on the oven here.

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

Posted on Nov 27, 2010

specialistel

  • 8909 Answers

SOURCE: KitchenAid Architect II KHHC2090S Stainless

Perhaps the "repairman" should take another look at it. A lot of microwave ovens have an aerial that directs the energy out to the load or food to be heated.
Maybe...maybe not but worth a look behind the waveguide cover I would say.

Posted on Mar 24, 2011

heatman101

D. Floyd Kolb

  • 43501 Answers

SOURCE: Everything seems to work except

Hi,


Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101



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Posted on May 03, 2011

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Runs but doesn't heat replaced two fuses and magnetron still doesn't heat


Here is your free answer in under 10 minutes ...

You have a faulty door safety interlock switch. I wish you would have searched your problem here before you spent all that money on the magnetron. I have answered this question dozens of times here at this site.

When the oven runs but doesn't heat, more often than not it is nothing more than a faulty micro switch in the door latch system. When the switch doesn't work properly, the oven doesn't know the door is closed. If the door isn't closed, the oven will not energize the magnetron. Capacitors and magnetrons are **** and expensive answers but these items are extremely tough. It is the tiny contacts in the micro switch that can not stand the repeated abuse given them when we (read me in that number too) open the oven while it is energized causing a repeated flash across the contacts.

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