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Troubleshooting
Symptom
Display does not come
Display does not come
on.
Temperature settings do
not change.
g
Heating or cooling does
not come on.
not come on.
Thermostat is calling for
heat (Heat ON) or cool
(
(Cool ON); but HVAC
)
system is not operating.
t
i
t
Thermostat does not
respond when touch
screen is pressed.
NOTE − Perform installer system tests (page 15) to verify thermostat control
of HVAC system.
Possible Cause
Thermostat is not being
Thermostat is not being
powered.
Upper or lower tempera-
ture limits were reached.
Keypad is fully locked.
Thermostat minimum−off
time is activated.
System selection has
not been set to heat or
cool.
System type selection is
incorrect.
Heating or cooling
equipment is not
operating.
operating.
ti
Keypad is fully locked.
Page 16
Action
Check to see that there
is 24V between R and C
terminals.
Check to see that
batteries are properly
installed.
Check temperature
setpoints.
Check installer set−up
numbers 0600 and
0610. Modify, if neces-
sary.
Check installer set−up
numbers 0670 and
change keypad lock
option, if necessary.
Wait up to 5 minutes for
the system to respond.
Select proper system
mode.
Check installer set−up
number 0170 and make
sure proper system type
is selected.
Check wiring.
Check installer set−up
number 0170 and make
sure proper system type
is selected.
Verify operation of
equipment in system
test mode.
Check installer set−up
numbers 0670 and
change keypad lock op-
tion, if necessary.
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