My first post and also my first problem with my Whitfield Advantage III. Installed in 1991 and working great all these years. This season the stove was a little louder then in years past but was working well. I pulled the combustion fan and the impeller fan blade had lost a couple of fins and needed replacing. I ordered the impeller and new gasket. Cleaned and oiled the motor and reinstalled with the new blade. The stove worked great and was very quiet. Burned a bunch of bags over Thanksgiving without a problem. After a good cleaning the stove was restarted and burned on high until it was warmed up. Then turned down to the second lowest setting. It was burning fine. After about 1/2 hour the house was full of smoke. A little scary. Once the flow rate was turned back up the combustion fan kicked in and exhausted the smoke from the stove and a few open windows took care of the smoke in the house. I cleaned the stove and fired it up a few days later no issues. My girlfriend lit the stove while I was out of town and it was burning good on high but filled the house again with smoke after it was turned down. Once the auger switch was turned back up to high it started to exhaust the smoke again. Is it time to replace the exhaust motor it could this be a bad limit switch of some sort ? Sorry for the long post but it's frustrating after years of excellent service I'm afraid to light my stove.