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Pull blower panel off and you will see the wires from thermostat in front of you. Should be
Red to R
Yellow to Y
White to Aux/W2
Green to G
Orange to O
Blue to C on new thermostat.
If you had a Trane thermostat Blue would be connected to B on old thermostat but C on new one if it is not Trane.
Do you still have a problem. Russ