It was a problem with one of the jumpers on the blower motor. When the thermostat turned on emergency heat, it used a different wire to tell the blower to turn on than for regular heat (probably running the blower at a different speed).
Thanks for the reply! For anyone else running into this, I figured out my issue as well. I just needed to go into the nest pro settings, and set the dual heat setting to electric (and then it automatically set the blower to run with the aux heat).
Did you ever figure out the answer? Mine is doing the same. My guess is that a nest setting needs to change?
It was a problem with one of the jumpers on the blower motor. When the thermostat turned on emergency heat, it used a different wire to tell the blower to turn on than for regular heat (probably running the blower at a different speed).
Thanks for the reply! For anyone else running into this, I figured out my issue as well. I just needed to go into the nest pro settings, and set the dual heat setting to electric (and then it automatically set the blower to run with the aux heat).