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have you tried disconnecting the wire on G terminal directly at the furnace control board ?
If fan shuts off this would indicate that you there is short on that wire
Did you find the problem?
OK, let me know what happens.
Hey I am here, just reading your update
Test wires is done with a ohm tester and disconnecting the wires at both ends and test them one by one.. get it?
And also the economizer might have a bad relay and it is calling to turn fan on