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Hi all. My first post and I did do a search. I have an older Lennox electric furnace, late 70s, only the lower two elements come on. After testing I found that power, for the upper two, stops at the sequencers. Now the problem, Lennox no longer supply's them and they are no longer in production. I know that there is a substitute but I have no idea what I'm looking for Lennox calls them Heater relays and others call them sequencers I don't know if they are the same thing. I have seen what are called stacked sequencers they look completely different from mine but might work. I guess I am looking for someone that can walk me through finding a replacement.