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Thanks again for the reply; I just read it now but I'd already sat down and carefully thought about how to wire it, and my results matches yours :) .

However, after trying it out, I've discovered...

Well, some of that makes sense :) :confused: I guess...

There's a transformer on the furnace now, with 2 wires (white and red) which go to the thermostat for heat calls (red to the R contact on...

I have an oil furnace, controlled by a thermostat that only has 2 wires going to it, but I want to be able to turn on the fan only from the fan switch on the t-stat. There do not appear to be any...