I have a wodd pellet stove a American Harvest 6039, and I cleaned it on a thursday , and started up ,it worked fine on level1, on friday morning it was on level 9 and the fire was filling the chamber. I couldn't get it to turn off, so I pulled the plug. I opened the door and the pot was full of pellets. I left alone for the day , I came home and I plugged it back in ,and it came up with ERR4. What does that mean , and how do i fix it.