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Symptom
Heating equipment is run-
ning in the cool mode.
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).
Cannot set the system
setting to Heat.
Cannot set the system
setting to Cool.
Heat On is not in the dis-
play.
Cool On is not in the dis-
play.
Wait is in the display.
Screen Locked" appears
on the screen and all or
some of the keys do not
respond.
Specifications
Electrical Ratings:
W (Heating)
Y (Cooling)
G (Fan)
A (Economizer/TOD)
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).
505103M 11/08
Table 7. Troubleshooting
Possible Cause
Heating equipment is not
a heat pump but System
Type (Installer Setup
Number 0170) is set to
Heat Pump.
Heating equipment is not
a heat pump but System
Type (Installer Setup
Number 0170) is set to
Heat Pump.
System Type (Installer
Setup Number 0170) is
set to Cool Only.
System Type (Installer
Setup Number 0170) is
set to Heat Only or Heat
Only with Fan.
System setting is not set
to Heat and/or tempera-
ture setting is not set
above room temperature.
System setting is not set
to Cool and/or the temper-
ature setting is not set be-
low room temperature.
Compressor minimum off
timer is active.
The keypad is fully or par-
tially locked.
20 − 30 Vac
0.02 − 1.0A
20 − 30 Vac
0.02 − 1.0A
20 − 30 Vac
0.02 − 0.60A
20 − 30 Vac
0.02 − 1.0A
Action
Set System Type (Installer Setup Number 0170) to
match the installed heating and/or cooling equipment.
Set System Type (Installer Setup Number 0170) to
match the installed heating and/or cooling equipment.
Set System Type (Installer Setup Number 0170) to
match the installed heating and/or cooling equipment.
Set System Type (Installer Setup Number 0170) to
match the installed heating and/or cooling equipment.
Set the system setting to Heat and set the temperature
setting above the room temperature.
Set the system setting to Cool and set the temperature
setting below the room temperature.
Wait up to five minutes for the cooling or heating (heat
pump) equipment to turn on.
Check ISU 0670 to change keypad locked options.
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
Page 12
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Table of Contents
Troubleshooting
