i have an older Englander pvd from 2004/2005 which I have been using for 5 seasons. Beginning of every season i get it cleaned professionally and am diligent about cleaning it weekly. Today I came home and the house was at 59 with the stove running at 1. I moved it up to 3 and 3 and still not much heat kicking out. I fixed the lower 3 numbers to 3-5-1 and they were previously set to 3-3-1. Currently using green supreme but the higher I go heat wise the less the pellets actually burn through and cause “ congestion” on the burn pot. Any ideas? Thanks!