I recently purchased a Honeywell TH8320 programmable thermostat to bring a little energy efficiency to my new home. I have a Carrier 25HBA3 Base Series split system pump with a unit outside, and one indoors (installed up in the attic space above my garage). I detached the previous thermostat and made note of the wire colors and connections, and followed the instructions in the Honeywell manual to the best of my understanding, though I am not finding success in getting the heater to operate.

Here are the connections as per the previous thermostat:

W* --
O -- White Wire
G -- Green Wire
R -- Red Wire
C -- Blue Wire
Y* -- Yellow Wire

*There is a small length (about 0.5") of green wire that seems to be acting as a jumper connecting that goes from the W terminal to the Y terminal.

When I try connecting my Honeywell TH8320, I am not able to get the heat to turn on. I did something last night that had heat coming on when I had it set to cool, but I decided to completely disconnect all wires from their terminals and start from scratch, though to no avail.

Based on my heat pump, I am assuming that it is a 1H/1C Heat Pump with no auxiliary heat, though perhaps I am mistaken.

My connections to the Honeywell terminal are as follows:
RC and R are connected by a jumper, with the red wire from the wall connected to the R terminal.
C -- Blue Wire
Y -- Yellow Wire
G -- Green Wire
O/B -- White Wire
The small length of green wire is connected to both the Y terminal and the O/B terminal (Since for conventional systems, it shows that the O/B terminal is actually the W terminal).

I think I am so close to having this correct, and I am seeking a little help to get me to a more energy efficient home. Thank you for any assistance and guidance!

I was able to solve this problem on my own - the solution was to remove the sole green wire acting as a jumper between the W and Y terminals.