Thanks Bill
I was talking about insulating the sequencer base from the front of the furnace. I'm not sure what causes a sequencer to fail internally but it's attached right next to the coils so I'd imagine it's subject to some extreme temps.

Thanks Bill
I just replaced the sequencer not long ago (2 years I think). Would insulating the base from the furnace increase it's life span?

Even with thermostat disconnected both heat and fan runs continuously.
Would this be sequencer or can something else cause this?