After 3 blessed months of burning well my mini is now possessed. It is over-feeding on all interval settings, with full combustion air and the damper pulled all the way out. The flame quality is good when all adjusted but the burn pot fills up and overflows within 3-4 hours. All I need to do is slow down the feed rate. Is this a control card issue? or? or? Any help gratefully accepted. Happy New Year! Timberman