I'm trying to replace my old heat pump thermostat. However, i can't get any cool. When you call for COOL, it stucks on HEATING mode. Whenever I call for HEAT, it just stays there: no fan (AUTO mode), compressor doesn't kick in.

--- Heat pump terminals (R,O,Y,G)----
R connects to RED (24vpower)
O connect to BLUE wire (rev)
Y connects to YELLOW (cool)
G connects to G (fan)
(There is no WHITE (heat) wire!!)

New thermostat has R (Rh/Rc jumped), Y, C, O/B (W), G

Thanks for your help!!!