I am trying to upgrade my Luxpro thermostat to a Honeywell RTH7500D programmable thermostat. I had all of the connections matched up except for two. Any help would be appreciated. Here is what I have:
Luxpro (old Tstat)
E-brown wire
Y-yellow wire
B-black wire
O-orange wire
W2-white wire
R-red wire
G-green wire
C-blue wire

My new Honeywell has:
C, G, Y, O/B or W, RC, R, W2 or Aux, Y2 or E, L

Can anyone tell me what goes where or how to find out?

The more research I do, the more I think that my old thermostat was wired incorrectly. The Luxpro manual says to use the B terminal OR the O terminal, not both. The wiring diagram on my Goodman CPLJ36 does not show the black wire (B) going to the thermostat at all. Should I just tape this one off?

Any thoughts?