Last January I upgraded the Baby's combustion blower to the high output model recommended by AES. At that time I also start using the cast iron pellet only pot. These upgrades turned her into a fire breathing pellet burner. Well...now not so much. I don't know if the combustion blower is failing or what. You can start it normally either manually or with igniter. Shortly after the distribution blower kicks in, the combustion blower kicks off. This happens roughly 90 seconds after the room fan starts and causes #2 blinky vacuum error. I've done the following things to try to figure this out: 1. Cleaned top to bottom, inside and out....leaf blower tricked and air compressor...everything. Stove is clean. 2. Blew through vac line to stove and it's clean. Just for good luck I ran a piece of wire through steel vac line to firebox to clean. 3. Bypassed vac switch....did same thing. 4. Bypassed proof of fire...did same thing except room blower started right away as it should have with switch bypassed. 5. Removed proof of fire switch and cleaned...did same thing. 6. Double checked venting and air intake for obstructions...all clear. 7. Made sure combustion blower motor was clean and free of dust bunnies, etc., and moving freely. 8. Wired combustion blower to patch chord and lit manually. It runs strong as ever. When I did this, I kept the stove unplugged and fed pellets by hand. I didn't time anything, but after getting a decent little flame going...combustion blower shuts down. What am I missing? Is the blower failing or what? I think I have it narrowed down to the blower motor right?