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Well...
It doesn't appear that this unit HAS a thermocouple. What is does have is a flame sensing rod towards the right side of the burner element (the ignitor is on the left side).
There is also a rubber vacuum tube that runs from the gas switch to the burner/combustion chamber, connecting to a small nipple on the side of the burner chamber. I had noticed that this nipple was loose (it is tightened to the side wall of the chamber with a nut on each side); once I found this, I was hopeful that vacuum was being lost. No such luck.
I've also noticed that the unit seems to work for one complete cycle if I shut it off for a while (at the thermostat) in most cases, then reverts back to its evil ways.
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