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hi i am dan i can help you with this. you are correct the flame is not being sensed. there is a little rod in that assembly that seses the flame. most likely you just need to clean it. also what model gas valve is used on the furnace
i know a lot of the time they are very tricky to remove but you may be able to clean it wit a wire brush, sand paper, steel wool without removing it if you can get in there. if not then it would require removing the sheilds around it.
Ok just reply back when you are ready