I just had a new system installed: Carrier Infinity heat pump; Carrier Infinity 80 furnace; Infinity thermostat; and Aprilaire 5000 EAC. The contractor has not been able to properly integrate the EAC with the furnace. The EAC is working properly, and goes on and off with the furnace, but its control unit stays on continuously, with the little lights flashing. The control unit is also supposed to be able to control the furnace fan - if you select "constant cleaning" it should turn the fan on - but it doesn't. Is it possible that the control unit and furnace can't be integrated, or is there some trick my contractor isn't aware of?