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.
I have a XV90 Trance furnace that is calling for heat and before the inducer motor kicks in, the 3 flasshes go off indicating inducer error. I checked the intake pipes and looked into the inducer from above and all of that seems clear. I had a blower motor replaced last year.
So, now I need to identify if problem is in pressure switches or the motor. I have a multimeter and I know how to use it, I just do not know the specifics about what wires/leads to check to find bad parts.
Pressure switches (two of them) how do I check? Which connections.
The inducer motor has a ECM on the outside. There are is a packet of wires going into the ECM. Only a couple of wires or so going into the inducer. How do I test the inducer?
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