Hello folks. I am having a problem with a used, 2 year old Lopi Pioneer that I purchased recently. The installation was pretty simple, through the wall with all manufacture specs met. The only thing I did not do was install a OAK, as per the advise of 2 separate Lopi dealers. My issue is that after about 45 minutes or so, my burn pot begins to overflow. I mean alot. It will build a pile high enough that it begins to back up ito the pellet drop shute. This causes my flame to "smother" and loose all efficency. I, in return, shut the unit down beacuse the pellets begin to pile up after falling out of the burn pot unburned. I took the panels apart and looked in all the passages, cleaned the burn pot, installed a new 7/8 rope gasket around the door etc. The blowers are clean and seem to be working properly. The vent pipe is new so there are no blockages. It seems that the auger keeps dropping the pellets faster then the unit will burn them. I get good heat form the unit for the first 25-35 minutes, then the air seems to become cooler. I watched some videos on You Tube and I can say my unit is no where near producing a flame like those units. It just seem to produce a weak flame if you would. I have tried adjusting the airflow as well with the slider with no positive results. I would greatly appreciate any suggestions.