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I recently had a technician install a new ecobee thermostat, but he disconnected the control board from on top of the furnace. he bypassed the board to install the thermostat. Is there a way to manually wire the aprilaire fresh air circulation into the thermostat, or is it better just to remove that from the system? I have another thermostat I am looking to replace which will be in the same situation. There are only 3 wires to the builder installed thermostat (red, white, and blue) labeled 1,2, and 3 respectively.

  • Hello, and welcome to Home Improvement. It's hard to know what you're talking about; would you add information (e.g. make/model of the furnace) and perhaps a picture or two? And, you should probably take our tour so you'll know how best to participate here. – Daniel Griscom Nov 13 '19 at 0:52
  • Can you post make/model information for all equipment involved, as well as wiring diagrams and photos of the control wiring? – ThreePhaseEel Nov 13 '19 at 1:30

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