I do not have a wiring diagram for that unit and Trane refuses to give any help on their units. As far as the pressure switches, you can pull the wire off them and check with a ohm meter to see if they are open or closed. There is a red reset button on there also, and make sure the drain and trap on the bottom of the inducer are clean and free of any debri. The three flashes means the vent pressure is wither too high or to low.
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10 years ago