Thanks for your reply and info. I will check the wiring to see if any are loose and get back to you. Hopefully we can straighten this thing out

I recently replaced both sequencers in my furnace with #01-0841 and 01-0840 (Hopefully these are the correct ones) and now when I turn my t-stat up to kick the heat on the coils both heat up but the fan doesnt turn on. Any ideas what could be causing this? Before I replaced the sequencers, when I tu...