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Troubleshooting
Symptom
Display does not come
on.
Temperature settings do
not change.
not change.
Heating or cooling does
not come on
not come on.
Thermostat is calling for
heat (Heat ON) or cool
(Cool ON); but HVAC sys-
tem is not operating.
Thermostat does not
respond when touch
screen is pressed.
NOTE − Perform installer system tests (page 19) to verify thermostat
control of HVAC system.
Possible Cause
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 equip-
ment is not operating.
Keypad is fully locked.
Page 20
Action
1− Check to see that there
is 24V between R and C
terminals.
2− Check to see that bat-
teries are properly
installed.
1− Check temperature set-
points.
2− Check installer set−up
numbers 0600 and 0610.
Modify, if necessary.
Check installer set−up
number 0670 and change
keypad lock option, if nec-
essary.
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.
1− Check wiring.
2− Check installer set−up
number 0170 and make
sure proper system type
is selected.
3− Verify operation of
equipment in system test
mode.
Check installer set−up
number 0670 and change
keypad lock option, if nec-
essary.
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