Honeywell RTH7400D User Manual

61 69-1726—1
Both the
heating and
cooling
systems are
running at the
same time.
Check Installer Setup Number 0170,
Heating and/or Cooling System Type, and
make sure the setting matches the installed
heating and/or cooling system.
Check and make sure the bare portions of
the wires are not touching.
Heating system
is running in
cool mode.
Check Installer Setup Number 0170,
Heating and/or Cooling System Type, and
make sure the setting matches the installed
heating and/or cooling system.
Heating system
does not turn
off and the heat
temperature
setting is set
below the room
temperature
(“Heat On” is
not shown in
display).
Check Installer Setup Number 0170,
Heating and/or Cooling System Type, and
make sure the setting matches the installed
heating and/or cooling system.
Red LED is on
in the upper left
corner and the
Heat Pump is
not working.
A system monitor is wired to the thermostat
L terminal. See Heating or Cooling system
does not turn on in the Troubleshooting
Tips.
Troubleshooting Tips (Continued)
If . . . Then . . .

Honeywell RTH7400D Specifications

General

Brand	Honeywell
Model	RTH7400D
Category	Thermostat
Language	English