My Frigidaire PLMBZ209GCA Microwave stopped working. I was in the middle of cooking something for 10 minutes and it stopped working half way thru, but the display kept on counting down. If I try to use it now, when I press start, the light comes on, but no fan, no turntable and no magnatron. From looking at the circuit diagram, it would look like the Primary Interlock is in the "open" position. However, when I look at the parts list, no such part is listed. Am I right in assuming that the Primary Interlock is incorporated into the door switch interlock? If so, is it normal for it to fail in the middle of cooking? I would expect it "break" while opening and closing the door. Thx in advance

Good Afternoon Friend,

I understand that your Frigidaire microwave, model# PLEB30M9ECE, is cooking, but has stopped beeping. I suggest resetting your appliance, by either unplugging it or shutting the power off at your home's circuit breaker, for 3-5 minutes. Sometimes there can be a miscommunication between the different boards inside your appliance. Restore power and try any cooking cycle. I ask that you please follow up with a comment on the post, at your convenience, to advise if further troubleshooting is needed or if your appliances status has changed successfully. Hope this is helpful.

-Best Regards-
WP

Two things could have happen to your machine.
One the magnetron is dead and needs replacement.
Second the high tension power which supplies power to the magnetron could have been screwed up and need to be replaced or repaired.
The fact that the fan is not running I suspect it may be a power board issue.

Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron. Check this link to know how a microwave works:

http://www.espares.co.uk/advice/microwave/a/5/1443/how-a-microwave-oven-works.html

So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off. Check the wave guide covers, if food had deposited
then it must be checked or replaced. See link: http://www.espares.co.uk/advice/microwave/a/5/1146/how-to-replace-a-microwave-guide-cover.html
Now keeping clear of the microwave, switch on; use a cup of water inside to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. replace with same type.

see the information attached and test the main component for SHORT. God bless you

yeah you blow something
check the rectangular plate inside the cooking chamber that its not damage.
Second replace the magnetron.

Thanks

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Don't have a fix for your problem, but my Frigidaire microhood just did the exact same thing--about the same age, started cooking some food and it worked for a few minutes and then just stopped--time kept going, light stayed on, but turn table stopped and fan noise cut out. I tried it a few more times and it seemed to fade in and out and then stopped trying.

its a defective lower door interlock switch or a faulty relay or triac. First try again a pick up a little or push down a little on the door and see if it will work

The simplies is the fuse, which is located inside the unit, you need a screwdriver to open it

What you are saying the microwave stop work like heating,but but the clock counts down.If it is stop heating then there is a rest on or near the magtrogron.Once it cools down it start back heating.Open and close the door will reset power to the magtrogen{sorry about the spelling].Look for loose connector,or replace the click zon it should have a small red buttom on it.