Honeywell RTH5100B Installation Instructions Manual page 8

Step 4. Follow Special Instructions (Cont)
4. Most installations have two to five wires connected
to the old thermostat. If six or more wires are
connected to your old thermostat (not counting
the C or C1 wires), do not continue the installation.
You may have purchased the wrong thermostat.
Visit www.honeywell.com/yourhome
Honeywell Customer Care at 1-800-468-1502
before returning the thermostat to the store.
W2
69-1716
OLD THERMOSTAT
Y1
G
Y2
SIX WIRES CONNECTED
LETTER
W1
DESIGNATION
SCREW
TERMINAL
WIRE
R
WIRE HOLE
8
or call
M22038