I own a Frigidaire Model FMV156DCC microwave over-the-range oven. It is about 5 years old and suddenly quit heating. Everything works, the timer counts down but it does not heat and the turn table does not turn.

I ahev the identical problem. Did you solve this?

The problem is the lower door switch inside the unit. You need this part:
V-16G-3C25-K Omron Electronics Basic / Snap Action / Limit Switches

Which I believe is the same as this part:
Part Details - ERP SWITCH NO 15A, part number: AP4347888

1. Turn off the power to the unit.
2. Remove the three screws from the top grill of the unit. Remove grill.
3. Remove screw on top of control panel unit. Remove control panel carefully from top first. You have to twist it at the bottom to remove without damaging.
4. There are three black switches, each with two wires attached, behind where the control panel was to the left. Remove the two wires from the lower most switch, and pull it out carefully without breaking the white plastic tabs holding it in.
5. Put in your new switch, re-assemble, and plug back in. Should work.

Feel free to shoot me an email if you need help.

David

Confirming this same diagnosis for my FMV156DCC as well - bottom switch is bad.

Some additional repair notes from my experience:

1) After removing the screw from the top of the control panel unit - no need to twist. Just push up from the bottom and the control panel should slide up about 3/16" and then release forward.

2) Use your digicam/phone to take several photos of the connections.

3) Remove the connectors from the control panel. Plastic connectors often have a lock tab on one side; press to allow removal. The spade tab connections also have small inner locking tines as well. Use fingernail or small screwdriver blade to press the inner locking tine to allow removal from the spade. Set control panel unit aside on a soft towel to prevent scratching.

4) Use a short handled or angled screw driver to remove the 2 screws from the latch switch assembly. Press upper release tab and slide up and the rotate loose.

5) take more photos of the switch wiring. press inner locking tines to release tabs and connector from the 3 switches. Plastic assembly with 3 switches should now be free.

6) Press locking tabs on plastic assembly to allow individual switches to rotate around their white holding pin and then you can easily remove.

7) Just my bottom switch was bad. I will likely replace them all to save future repair time. Bottom and top switch are the same type - so I find it interesting that just the bottom switch should fail. It may be handling a different current level and thereby fail first.

I was able to pull the bottom switch off pull it apart sand the contacts put it back together and get a temporary fix until I could get the part. Thanks so much for the people that have put this post up in this forum it helped a lot. Thx again.