need help wireing thermo. In house

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I had a weathertron(9051) and I am changing it but wires and letters are different between the two. New th. Hunter(44110)
old one has:

X2-white wire to the U and then seprate wire from U goes in the wall.
O-orange wire go's to the wall.
G-green wire go's to the wall
Y-yellow wire go's to the wall
T-Nothing to this one.
R-red wire go's to the wall
W-Nothing to this one
F-Nothing to this one
B-blue wire goes to the wall.

The new one has:

G,Y,W, and RC&RH that has a red wire going to one to the other.

Please help
Thank you
Phil

Sounds like you have a heat pump, and the new thermostat won't work with it. Read the sticky at the top of this forum. If you have a heat pump, and the thermostat directions say nothing about them, it isn't going to work.