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If thermostat has Fan ON/Auto switch, will blower work in ON position or Cool mode?
OK our next step is to see if we are getting power to motor.Do you have a meter for doing this?
You can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.
To do this we will put meter leads on Neutral and Heat in heat mode or Neutral and Cool in cool mode. to see if board is sending 120v to motor. See below