Honeywell RTH7400 series - Troubleshooting Common Issues; Display is Blank; Unresponsive Controls or Temperature Issues

RTH7400/RTH7500 Series
21 69-2487EF—01
About your new thermostat
SETUP WIRING ASSISTANCE TROUBLESHOOTING
Remove metal jumper connecting R and Rc only
if you must connect both R and Rc wires.
If your old thermostat had both R and RH wires,
remove metal jumper. Connect the R wire to the
Rc terminal, and the RH wire to the R terminal.
If your old thermostat had only 1 C or C1
wire, connect it to the C terminal. If your old
thermostat had 2 C or C1 wires, wrap each
separately with electrical tape and do not
connect them.
Wiring—conventional system
Alternate wiring (conventional systems)
If labels do not match terminals, connect wires as
shown here (see notes, below).
C
G
Y
W
RC
R
W2
Y2
Y2
W2
W
Y
G
MCR32160
R
2
Rc
2
C
3