Troubleshooting Guide • Homeowner Manual
20
No Cool
Possible Cause
Corrective Action
Cooling system requires
service or thermostat
requires replacement.
Diagnostic: Press SYSTEM button to select
COOL
and press
to lower the temperature
setpoint below room temperature. Within a few
seconds the thermostat should make a soft
click sound. This sound usually indicates the
thermostat is operating properly. If the thermostat
does not click, try the reset operation described
on page 17. If the thermostat does not click after
being reset, contact your installing contractor for a
replacement. If the thermostat clicks, contact the
furnace manufacturer or HVAC contractor to verify
the cooling is operating correctly.
No Heat or No Cool
Possible Cause
Corrective Action
Thermostat may be in
Load Shed (“Event in
Progress” displyaed on
top line of LCD)
Wait for the Control Event to end.
Heat, Cool, or Fan Runs Constantly
Possible Cause
Corrective Action
Fan set to
ON
.
Change Fan to
AUTO
.
Possible short in wiring,
thermostat, or HVAC
system.
Check each wire connection to verify they are not
shorted or touching together. No bare wire should
stick out from under terminal screws.
Try resetting the thermostat as described on
page 17.
If the condition persists, the manufacturer of your
system or HVAC contractor can instruct you on how
to test the HVAC system for correct operation. If the
system operates correctly, replace the thermostat.