Product review (1 stars): Prepare to take it apart again!
Thermal fuse lasted two weeks.  Ended up changing both the high limit and thermal fuse with LG parts.  I know that there is a possibility that it could have been an air flow issue but the original system worked for 12 years on the same system...this lasted only two weeks...and with the new LG parts installed, it has been going for a month now.  I rechecked my exhaust and flow thoroughly.  I guess the heat coils and housing are OK but that is about all I can say.