Thank you for your reply. It is a top filter unit. I did take the thermal fuse out and checked continuity and is OK. Yes. it was pretty dirty but since, I have cleaned it all very thorough.
I can not find a model on the unit, neither on the instruction and installation booklets. All I can find is that is a Heavy duty Super Capacity 5 Cycle 3 Temperature and was probably manufactured on Oct 14, 2009 which is what says on top of control panel.