Sounds like we are getting close to the problem. Try the jumping vac switch wires, but first, use a mirror and flashlight and look up the drop chute from the firepot to see if there is any bridging of pellets. You can also try unplugging stove and making sure the control box is seated properly. Sometimes vibration can make them slip just enough to mess up stove operation. If not these, pull cover off thermocouple and check end, and or, do a continuity test on it. When putting back on, make sure the tcouple is touching the inside end of the cover or it won't read right. It should also be sticking into the pot 3/4 to 1". It does not deliver a lot of pellets at initial startup. It will feed for 60 seconds. Stove then has four minutes and 15 seconds to reach 200*. kap