We did empty the hopper as much as we could and let the unit run as low on pellets until it would no longer run. The auger spring looks intact. We vacuumed the hopper out as far as we could go. I used a mirror to look up the shoot from the fire box and could not see any major restrictions. - i do have the correct light sequence. And the convection blower comes on and blows hot air. All the while the flame is barely sustained.