I have a EFM 520 and have been trying to fix the circle of fire in my burn pot but I just can't seem to get it back. It all started when I had a big piece of coal clog the auger and it was trying to run for hours before I came home to find it. I have cleaned all the grate holes several times, grate holes are all clear. Also cleaned the auger. After shutting down and cleaning everything two different times I still have a pie section at about seven o'clock not burning bright like it should. When I relight the fire circle looks good for the first day but the pie comes back.
After these two attempts to fix my fire I removed the stoker from the boiler, disassembled it and installed all new gaskets then reassembled. Yesterday fired up for the year and the pie is back this morning.
Has anyone had this happen? Can anyone offer advise to fix this problem.