Honeywell RTH7400D User Manual

69-1726—1 60
Cannot set
System setting
to Cool.
Check Installer Setup Number 0170,
Heating and/or Cooling System Type; make
sure the setting matches the installed
heating and/or cooling system.
“Heat On” is
not shown in
the display.
Set the System setting to Heat and set the
temperature setting above the room
temperature. If “Heat On” is shown solidly in
the display, but the heating system does not
turn on, see “Heating system does not turn
on” in the Troubleshooting Tips.
“Cool On” is
not shown in
the display.
Set the System setting to Cool and set the
temperature setting below the room
temperature. If “Cool On” is shown solidly in
the display, but the cooling system does not
turn on, see “Cooling system does not turn
on” in the Troubleshooting Tips.
“Wait” shows in
the display.
Compressor minimum-off timer is active.
Wait up to five minutes for the cooling or
heating system to turn on.
Fan does not
turn on in a call
for heat
(electric fur-
naces only).
Check Installer Setup Number 0180, Fan
Control in Heating, and make sure it is set
to Electric Heat.
Heat pump
puts out cool
air in the heat
mode and
warm air in the
cool
mode (heat
pumps only).
Check Installer Setup Number 0190, Heat
Pump Changeover Valve, and make sure
the setting matches the changeover
required by the installed heat pump.
Troubleshooting Tips (Continued)
If . . . Then . . .

Honeywell RTH7400D Specifications

General

Brand	Honeywell
Model	RTH7400D
Category	Thermostat
Language	English