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SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
No Heat (cont.)
No Cool
5. Heating system requires
service or thermostat requires
replacement.
1. Thermostat not set to Cool.
2. Loose connection to thermostat
or system.
3. Cooling system requires
service or thermostat requires
replacement
Diagnostic: Press the
SYSY
SYSY
SY
STEMSTEM
STEMSTEM
STEM button until Heat is
displayed and raise the setpoint above room tempera-
ture. 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 by pressing the
FF
FF
F
ANAN
ANAN
AN, TIME
BB
BB
B
AA
AA
A
CKCK
CKCK
CK, and the temperature
DODO
DODO
DO
WNWN
WNWN
WN
arrow at the same time. If the thermostat does not
click after being reset, contact your heating and
cooling service person or place of purchase for a
replacement. If the thermostat clicks, contact the
furnace manufacturer or a service person to verify the
heating is operating correctly.
Press the
SYSY
SYSY
SY
STEMSTEM
STEMSTEM
STEM button to Cool and lower
temperature below room temperature.
Verify thermostat and system wires are securely
attached.
Same procedure as Diagnostic for No Heat condition
except set the thermostat to Cool and lower the
setpoint below the room temperature. There may be
up to a 5 minute delay before the thermostat clicks in
Cooling.
Troubleshooting