Do you have a way of matching the color of the wires to the thermostat? I have 5 wires coming out of the wall, Green, Red, Blue, White, and Yellow.

Red= transformer
Yellow= contactor A/C
Green= fan
white=heat
blue= reversing valve energized in heating.
Orange=reversing valve energized in cooling

Note you should have marked them when removed from the old thermostat.