Honeywell RTH3100C Owner's Manual page 6

Alternate Wiring
4
E
or
X
X2
E
If the old thermostat had both V and VR wires, contact a heating/cooling
contractor for help.
If the old thermostat had both O and B wires, attach the B wire to the C
terminal. If another wire is attached to the C terminal, call 1-800-468-1502
for help.
If the old thermostat had W1, W2 and Y wires, contact a heating/cooling
contractor for help.
If no wire matches the E terminal on the new thermostat, use a small
piece of wire to connect terminals E and Aux.
7 Install Batteries
Install two AA alkaline batteries.
3 3
Aux Y G
or or
W Y1
W1 M
W2
Aux Y G
Back of thermostat
2
O L
or or
F F
O L R
6
1 2 2
R B C
or or or
V H B
VR X
B C