I've got an older Harman PF100 - serial no. is #12XX. Put a new igniter in the other day - new models are the fifteen fin. Went to fire it up this morning and it wasn't starting on automatic. Stove/vents/the whole nine yards are cleaned out. But when put my fingers into the burn pot right over igniter - it's just barely warm. Igniter light is lit up on circuit board. So I ended up switching to manual mode. I'm beginning to wonder if the igniter wasn't the problem in the first place. I ran it all last winter in manual mode - it does heat our 2500 sq. ft. home. Any suggestions? Thanks in advance.