GE Advantium oven - no microwave

Microwave Repair
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Dear Friends,
I’m having a problem exactly as Dave posted in September where all looks and sounds fine in microwave mode except it doesn’t heat. I have noticed on my oven a cover that closes over the light bulb during the microwave process is rotating closed then returning to the open position after a few "bounces" in the closed position. This doesn’t seem right, but I don’t know. Does this cover interlock the microwave process?

After removing the keypad, I found a switch that is actuated by the oven light cover. At first it didn’t seem to be working as I checked the blue & yellow wires that appeared to be coming from the switch to the PC board. When I took the switch off it checked OK. I followed the wires and found that the switch is in series with a thermal switch that reads open. This is described as "Hood T.C.O." Does this sound like the problem?

Sorry to ramble on with the "play-by-play". Maybe some of this is helpful.

Thanks, Kelly

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The hood tco should be open. It is designed to turn the vent fan on if the bottom of the m/w get’s to hot from cooking on the stove. Look closely at the top switch of the latch assy. Look for a small melted spot where the terminal meets the plastic housing of the switch. If this switch is bad or the bottom one it won’t heat.