Emerson 1F97-391 - Manual (Page 45)

43
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 SY SY SY SY SYSTEM STEM STEM STEM 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
F
F F F FAN AN AN AN AN, TIME B B B B BA A A A ACK CK CK CK CK, and the temperature DO DO DO DO DOWN WN WN WN 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 SY SY SY SY SYSTEM STEM STEM STEM 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