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Can you please tell me how many wires are connect to your inducer fan?
and gave you spun the inner cooling fins to see if it is rotating freely?
Well that is bad news...the failure is in the ecm motor itself. This is the last thing you want breaking down on this unit.
Here is an example of the replacement
But shop around...even call a trane dealer to see if under warranty for parts.
I am sorry for the news...but the high tech ecm motors are not field repairable
correct..what it says in short story version is the circuit board received 24v on W terminal and told the board to activate heat. The board has sent signals to run motor, yet there is no electrical activity from the motor in the form of amps.
The board reads this as "I sent power but there is nothing running"
Thus we have the 3 code