88
Table 10. Troubleshooting. (CONTINUED)
Symptom Possible
Cause Action
Cooling does not turn on (Cool
On is solid in the display).
Loose or broken wire connection
between thermostat and cooling
equipment.
Check for 24VAC between the cool
terminal (Y) and transformer common. If
voltage is not present, check the wire
connection (loose or broken) between
the thermostat and the cooling
equipment.
Fan does not turn on in a call for heat
(electric furnace).
Fan Control in Heating is set to Gas or
Oil Furnace (Setting 0180).
Set Fan Control in Heating to Electric
Furnace(Setting 0180).
Heat pump puts out cool air in the heat
mode and warm air in the cool mode.
Changeover Valve (Installer Setup
Number 0190) is not configured to match
the changeover required by the installed
heat pump.
Set Changeover Valve (Installer Setup
Number 0190) to match the changeover
required by the installed heat pump.
The heating equipment is not a heat
pump but the 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.
Both the heating and cooling equipment
are running at the same time.
Heating and cooling wires are shorted
together.
Separate the shorted heating and cooling
wires.
Heating equipment is running 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 temperature setting is set below
room temperature (Heat On is not in the
display).
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.
STS11 Touchscreen Programmable Thermostat
STS11 Touchscreen Programmable Thermostat
89
Table 10. Troubleshooting. (CONTINUED)
Symptom Possible
Cause Action
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 display.
System setting is not set to Heat and/or
temperature 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 display.
System setting is not set to Cool and/or
the temperature setting is not set below
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 partially locked.
Check Installer Setup Number 0670 to
change keypad locked options.
Room
TUE
Installer
Setup
Number
Insta
0270
0280
B
0300
Cha