Honeywell RTH7400 series - Troubleshooting System Response; Heating or Cooling System Not Responding

Advanced Installation Guide
69-2487EF—01 22
About your new thermostat
SETUPWIRINGASSISTANCETROUBLESHOOTING
Connect wires: Heat Pump
1. Match each labeled wire with same letter on new
thermostat.
2. Use a screwdriver to loosen screws, insert wires into
hole under screw, then tighten screws until wire is
secure.
3. If E and Aux do not each have a wire connected,
use a small piece of wire to connect them to each
other.
4. Push any excess wire back into the wall opening.
Labels don’t match?
If labels do not match letters on thermostat, see page
23.
Wiring—heat pump
Wiring complete, return to Step 7.
C
G
Y
O/B
RC
R
HEAT PUMP
MCR28104A
Aux
E
L
LABELED WIRES
SCREW
INSERT WIRES
THEN TIGHTEN SCREWS
WIRE HOLE
Y
G
R
O
HEAT PUMP
Aux