I'm running my Biomass 60 with the settings in the tuning sticky and have been for 2 months now. With no changes made, I'm in unable to burn through a load. I can't even burn through 4 or 5 pieces set directly on the nozzle. Same wood,split size seems iirrelevant. When running, stack temp seems to be at 275 just as before. I'm at a loss. Played with fan speed to no avail. Changes in the shutter setting. Nothing seems to keep it going. I'm at a loss and tomorrow's weather is not going to be good for a boiler that won't fire.