Emerson Sensi ST75, Installation Manual

Page: 14 / 20

14
SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
No Heat/
No Cool/
No Fan
(common
problem)
1. Blown fuse or
tripped circuit
breaker
2. Furnace power
switch to OFF
3. Furnace blower
compartment
door panel loose
4. Loose connection
to thermostat
or system
1. Replace fuse or reset breaker
2. Turn switch to ON
3. Replace door panel in proper
position to engage safety
interlock or door switch
4. Tighten connections
No Heat 1. Thermostat not
set to Heat
2. Loose connection
to thermostat
or system
3. Heating system
requires service
or thermostat
requires
replacement
1. Set thermostat to Heat.
2. Verify thermostat and system
wires are securely attached.
3. Diagnostic: Set Mode to Heat and
raise the setpoint above room
temperature. Within five minutes
the thermostat should make a soft
click sound and the display should
turn red. This sound indicates the
thermostat is operating properly.
If the thermostat does not click,
try resetting the thermostat. 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, verify the heating system
is operating correctly.
Troubleshooting