I have a Vermont Castings Radiance Propane Stove. RNV40. It's a "b" vent I believe. It's always been a little hard to start but this year I can't keep the pilot lit when I turn the knob to the "on" position. I just hear a click and it shuts off. The pilot seems to be giving out plenty of flame to touch the thermocouple. I cleaned everything out really good. Any idea's? Maybe a new thermocouple? Thanks! Youtube video below: