I have a brand new, 15 year old, Vermont Castings Radiance direct vent 2650 gas stove. I say new in that it was installed but never connected to a gas line in the home I recently purchased. I hooked up the gas, lit the pilot and all is well until I turn on the burner. In less than 30 seconds the pilot starts to dance around the thermal couple, jumps away from the tee shaped pilot shroud and the ultimately goes out. It does not change shape or position, nor go out, on the other two sections of the tee. Obviously with no flame on the thermal couple everything turns off. While the flame might show a very slight yellow edge before it goes out there is almost no change in color. I have checked for blockage in both the intake and exaust. All looks clear. If I remove the glass it works fine. Any assistance that someone could provide would be greatly appreciated.