Frigidaire microwave FMV156DBC would turn on light & countdown timer but not "run". I have replaced all 3 door switch fuses - same thing happening with door closed but now it "runs" with the door open

One or two of the door switches has failed, replacement only option, consider price.

Tom, It sounds like either your magnetron and door switch have gone out or the control board. From your description, I would think that it is combination of the door switch and magnetron, which are expensive to replace - are you sure you want to put that type of money into a 9 year old unit.

http://www.searspartsdirect.com/partsdirect/part-number/Frigidaire-Parts/Microwave-Parts/5304408930/0022/628/Model-CPLMV168CC1/1428/0123370?keySuffixId=NA&productTypeId=0123370&searchModelNumber=CPLMV168CC1&subCompDesc=Functional%20parts&brandDesc=FRIGIDAIRE&modelDesc=MICROWAVE&blt=11

And the door switch parts are even higher.

The main fuse in the microwave oven has blown, usually caused by a defective door switch.

Replace after checking the door switches. If the interlock switches are not activating properly, things won't work.

I would replace the door switches and set up the door gap to 1/8" just enough to alow for a little play.
Setting the door square is acheived by slackening the lower door hinge and re tightening it when the door is square.
Hope that helps.

Hello :

That problem could happen because of a bad door switch .
There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly .

That could happen because of slamming the door and not closing it gently .

WARNING : A microwave oven is capable of giving you a serious electrical shock, even when it is unplugged. I strongly recommend you seek the assistance of an appliance repair technician when conducting any microwave oven repair .

good luck .

please rate !

What brand and model is it?If it's a Frigidaire it's a common problem,bottom door switch is bad.you have to remove the control panel to get to it

All lights are operational. Model number is FMV156DBC.

the door switches almost never break it sounds more like no power check the fuses on the pc bords

I had the problem where the timer continues to count down but turntable doesn't turn, fan doesn't come on and food doesn't heat. Holding the door up worked for awhile but even that temporary method stopped working.

I bought a door interlock switch the cost $23 from an appliance repair place and replaced it myself. It worked like a charm. To replace the switch, you need to remove 3 screws that hold the plastic grille above the door, which exposes the 1 screw that is holding the control panel. Remove that screw and slide the control panel up to remove it. There are three switches left of the panel. Note the middle swich has a different part number so I'm not sure what that one is called. The bad one on mine happen to be the bottom one. The switch is held on by a "pin" and tab that holds it in place. Push the tab and spin the switch on its "pin" past the tab to remove. Reverse your step to put the new one on. I hope this helps.