I'm not asking for a handout, but I truly feel it was installed correctly, and I burned this furnace properly. So I want to know (and perhaps warn others) what happened. If it was just from cleaning it really should be known that this could happen if not overly cleaned all the time.There are bagillions of these furnaces out there and we aren’t seeing this problem regularly so it could be a defect or something unique about this installation. SBI should be more helpful but I wouldn’t expect them to just send a replacement that might suffer the same fate.