Comfort Stat CDT901 - Manual (Page 101)

CDT900 Series Touchscreen Programmable Thermostata
Table 14. Troubleshooting. (CONTINUES)
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 24 Vac 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.
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