I bought a cabin that came with a Quadra Fire 2100 Millennium ACT. I just had my first fire in it 2 nights ago and it worked fine, I followed the manual instructions and closed the Start-up air control rod after about 15 minutes. The next night I went to start another fire and the Start-up rod would not go in, it is stuck in place. I still lit a fire, it just took longer to get going. Any ideas how to fix it?