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How far are connecting to furnace and is furnace communicating. Russ
Is this gas furnace or air handler. Russ
I have manual here let me check.
Are you wiring thru an IFC board for ventilator.
You ay have to revers the 24 volt wires on the transformed to get it to work. Might be reverse polarity.
I see 4 wires going from stat to IFC box and wire connection at bottom to dh
Right now remove ERV wiring and see if furnace connects.
Always try to connect on system at a time,