My Castille was running fine this morning when I shut it down. At lunch I turned it on. Dropped a few pellets then stopped. The circuit board is flashing three orange lights a couple of times and then it will flash blue four times. I keep the stove clean and 2 weeks ago I cleaned the chimney with the leaf blower. I have read that it could be the vacumn tube. Where do I find that? Any ideas on what is wrong? Thanks for the help in advance. Tom