Question about Frigidaire PLMB209DC Microwave Oven

1 Answer

Some sensor/switch is out?

The only way to engage the microwave is to ever so slightly touch the door button down, about 1/8".  It seems to be flush with face plate when you open/shut the door.  Didn't know if it is the "spring" behind the door causing problems (but it didn't seem likely as the button sits flush with the door), or if it were #5 on the schematic - switch/monitor/fuse, or something else.  If you don't press the button ever so slightly it will count down and the light will come on, but the microwave part won't engage.

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  • 5 more comments 
  • IGEAUX Jan 24, 2008

    It is a DCC. From looking at the schematic, I presume I undo the black casing and screws from underneath and that should get me in? What switch/part numbers? Anyway to test which is the culprit?

  • IGEAUX Jan 24, 2008

    I'll let you know what I find. Does the switch part you list include the bracket?

  • IGEAUX Jan 24, 2008

    Well, it's kind of strange. The lever completely depresses the little red pin switch on the switch. However, there is no continuity b/w the two leads unless you ever so slightly push on the door, allowing some of the red pin to raise, then it works. I did not some arching in running mode to stopping mode (ie, when I open the door completely) The other two switches seem to have continuity with door closed normally. Anything else I should check? The plastic bits and brackets look ok. How the heck do I get the switch out w/o breaking these little white bits of plastic holding it in. From what I see, there is a white pin that goes through the body, two bigger bits that fold over the edges and a smaller bit that rests on the bottom of the switch.

  • IGEAUX Jan 24, 2008

    There are three switches on the bracket. With the door closed, my meter will beep between the two terminals going into each switch. However, on the bottom one, it reads 148ohms with the door closed. If I push on it however, ever so slightly, it then beeps and microwave will function.

  • IGEAUX Jan 24, 2008

    OK, top and bottom switch are identical. So I switched them. Now, just the opposite, the microwave runs automatically when the door is shut, so something has to have gone crazy in the switch?

  • IGEAUX Jan 24, 2008

    No door alignment doesn't work. Tried that first. Problem is the switch in question has three settings with the dip pin, and I believe it is only supposed to have two. When the switch is completely depressed, something goes hay wire. Lift it up just a tad and in functions normally. Open it up all the way and it turns the microwave off like it is suppose to. Local distributor has one in stock. Figure for $20 I'd give it a try. Let you tomorrow evening if there are still issues with a new switch.

  • Anonymous Mar 24, 2014

    Flat stainless door release button (to open) keeps getting stuck. Door is very hard to open. Unsure if it can be easily repaired or how to access the lock mechanism. Any suggestions?

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  • Master
  • 770 Answers

There are two switches there do you know how to get into the control panel?? If not let me know I will walk you thru it

Posted on Jan 24, 2008

  • 9 more comments 
  • Gary Davd
    Gary Davd Jan 24, 2008

    Is the letters after the PLMB209DC an A B C or CB ??

  • Gary Davd
    Gary Davd Jan 24, 2008

    you want to unplug the unit on each side there are 2 -3 screws and around the back there are some screws you will need to remove (NOTE: one maybe a safety Screw) you want to remove these screws these hold the casing on Once the screws are out put your hands on both sides and pull towards the back of the unit the case will come off spin the unit around and you will now be able to see the 2 interlock switches where the door closes to.. the switch sounds ok but it may have to be re-seated in its bracket if it (bracket) is not broken this can happen if the door was slammed shut check it out and let me know.

  • Gary Davd
    Gary Davd Jan 24, 2008

    the upper and lower interlock switch part # is 5304440026

  • Gary Davd
    Gary Davd Jan 24, 2008

    once you are in you will see the switches on the brackets you will need a meter with contunity test to check them

  • Gary Davd
    Gary Davd Jan 24, 2008

    No the bracket # is called(Latch Hook) is part# 5304440840 cost about $20 the switch is around $16 each

  • Gary Davd
    Gary Davd Jan 24, 2008

    These are little micro switches about 1" long may have 2 or 3 wires going to them these are known as Door interlock switches they need to close in order for the microwave to work if by pushing down on the door and it working then you are forcing the hook lever thats on the door to press on the switch you will see what i mean when you open the case

  • Gary Davd
    Gary Davd Jan 24, 2008

    well they are held in just like you see them clipped in the plastic holder ..you may see a plastic pin going thru the switch to hold it in place but no screws on the switch As far as the electrical you will have a COM terminal then a N.O. Terminal and if it has 3 terminals a N.C terminal test with the sw out between the com and NO your meter should read open keeping the meter on it press in the sw you meter should change to closed To check the NC terminal and Common it will read closed press in the switch and it should read open

  • Gary Davd
    Gary Davd Jan 24, 2008

    First off are all 3 switches the same type?? it lloks like thwe bottom one is diffrent has a cable tied to it? not sure but it does show a diffrent part number on it.. Anyway the switch is good if you are getting it to work by pressing down now the question is can you adjust the switch to make the contact better?? by either adjusting the bracket or the switch or the closer on the door itself??

  • Gary Davd
    Gary Davd Jan 24, 2008

    you maybe able to tork the door down a little ..if it only needs a small amount to close that switch.. Worth a try

  • Gary Davd
    Gary Davd Jan 24, 2008

    did holding or tweaking the door make it work???? I think your best bet is to not replace them also it sounds like you have one switch that is N.O and one that has the NC( wires crossed) put them back like you found them,and try again with the door aligment your switches sound good from what you are describing

  • Gary Davd
    Gary Davd Jan 24, 2008

    Ok sounds good


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

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