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Good afternoon, I am Kevin one of the techs here on Ja. I'm trying to cross your model number, but it does not come up, are you sure this is the model number?
ok so what I am seeing now is a ECM motor..... and it is not getting to speed as the temp is going up your saying?
You have aver sophisticated furnace, please read the outlined area I have circled and let me know if this is the case...