Yes: I have a two stage hear pump and I finally got a two stage thermostat model # rth7400.

the old wires were ( y=yellow g=green 0=orange r=red w2=white and x=gray )
the new 7400 connection are C G Y O/B Rc R Aux E
I have tried (yellow to y) ( green to g) ( orange to o/b) ( r to r w/jumper rc) ( white to aux ) ( gray to c and e) only blow out hot air when set to cool.

what can I do to get this working. It seem to be a wireing problem but I don't know which wires are for what.

See if there is a sticky note for this at the beginning of this board.