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I have a WaterFurnace geothermal system with upper and lower level zones. I recently added an outdoor wood burner and my issue is that I want to use a secondary stat to run the furnace fan during the heating season. I was hoping that I can easily wire this to my furnace stat but that hasn’t been the case.

When I piggyback the red and white wire from the heat only stat to the red and green on the furnace stat, I get a flashing E1 code and nothing works. If I remove the red and green from the stat and tie them together, the fan will not come on. Any thoughts would be greatly appreciated. Thank you.