With stove off, put into test mode to see if auger is pushing pellets the way it should. I f there is something in the vottom of the hopper blocking the pellets flow it will not allow enough pellets to feed causing low fire.
That is interesting, I got a P-68 that will not build a big fire, seems to be running on about 20% potential and will do no more. I have done literally everything !! but I have not run it empty and looked at the auger. it pushes a very normal amount of pellets on start up but once it lights it seems to go into limp mode at the 20% of max as stated above. I think normal startup eliminates the pencil trick but I am outta other ideas.
I’m thinking about changing the esp and going from there. Stove has worked well in the past. Did notice at the end of last season that it wasn’t buring correctly but I just thought it was the pellets which I wasn’t a fan of.