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505103M 11/08
Table 7. Troubleshooting
Symptom ActionPossible Cause
Heating equipment is run-
ning in the cool mode.
Heating equipment is not
a heat pump but System
Type (Installer Setup
Number 0170) is set to
Heat Pump.
Set System Type (Installer Setup Number 0170) to
match the installed heating and/or cooling equipment.
Heating equipment does
not turn off and heat tem-
perature setting is set be-
low room temperature
(Heat On is not in the dis-
play).
Heating equipment is not
a heat pump but System
Type (Installer Setup
Number 0170) is set to
Heat Pump.
Set System Type (Installer Setup Number 0170) to
match the installed heating and/or cooling equipment.
Cannot set the system
setting to Heat.
System Type (Installer
Setup Number 0170) is
set to Cool Only.
Set System Type (Installer Setup Number 0170) to
match the installed heating and/or cooling equipment.
Cannot set the system
setting to Cool.
System Type (Installer
Setup Number 0170) is
set to Heat Only or Heat
Only with Fan.
Set System Type (Installer Setup Number 0170) to
match the installed heating and/or cooling equipment.
Heat On is not in the dis-
play.
System setting is not set
to Heat and/or tempera-
ture setting is not set
above room temperature.
Set the system setting to Heat and set the temperature
setting above the room temperature.
Cool On is not in the dis-
play.
System setting is not set
to Cool and/or the temper-
ature setting is not set be-
low room temperature.
Set the system setting to Cool and set the temperature
setting below the room temperature.
Wait is in the display.
Compressor minimum off
timer is active.
Wait up to five minutes for the cooling or heating (heat
pump) equipment to turn on.
Screen Locked" appears
on the screen and all or
some of the keys do not
respond.
The keypad is fully or par-
tially locked.
Check ISU 0670 to change keypad locked options.
Specifications
Electrical Ratings:
W (Heating) 20 − 30 Vac 0.02 − 1.0A
Y (Cooling) 20 − 30 Vac 0.02 − 1.0A
G (Fan) 20 − 30 Vac 0.02 − 0.60A
A (Economizer/TOD) 20 − 30 Vac 0.02 − 1.0A
Temperature Setting Range:
Heating: 40°F to 90°F (4.5°C to 32°C).
Cooling: 50°F to 99°F (10°C to 37°C).
Operating Ambient Temperature:
0°F to 120°F (−18°C to 49°C).
Shipping Temperature:
−30°F to 150°F (−34.4°C to 65.6°C).
Operating Relative Humidity (Non−condensing):
5% to 90%.
Thermostat Dimensions: 3−3/4 in. (95mm) high x 6
in. (152mm) wide x 1−3/8 in. (35mm) deep.
Accessories:
− X4148 Outdoor Sensor: 10K ohm NTC
− 47W36 Wall−Mount Remote Indoor Sensor 20K
ohm
− 47W37 Wall−Mount Remote Indoor Sensor 10K
ohm
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