Comfort Stat CDT901 - Manual (Page 99)

CDT900 Series Touchscreen Programmable Thermostata
TROUBLESHOOTING (TABLE 14)
Table 14. Troubleshooting.
Symptom Possible Cause Action
Display does not come on. Thermostat is not being powered.
Check for 24 Vac between C and Rc.
Check that AA batteries are installed
correctly and are good.
The upper or lower temperature limits
were reached.
Check temperature setpoints.
Check Installer Setup Numbers 0600 and
0610; modify as needed.
Temperature settings do not change.
The keypad is fully locked.
Check Installer Setup Number 0670 to
change keypad locked options.
Thermostat minimum off-time is
activated.
Wait up to five minutes for the system to
respond.
System selection is not set to Heat or
Cool.
Set system Selection to correct position.
Heating or cooling does not come on.
System type Selection is incorrect.
Check Installer Setup Number 0170 and
make sure correct System type is
chosen.
Thermostat is calling for Heat (Heat on)
or Cool (Cool on) but no heating or
cooling is running.
Heating or cooling equipment is not
operating.
Check wiring.
Check Installer Setup Number 0170 and
make sure correct system type is
chosen.
Verify operation of equipment in System
Test mode.
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