Lennox ComfortSense 8500 Series - Error Codes and Reminders; Built-In Temperature Sensor Errors; Remote Temperature Sensor Errors

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Error Codes and Reminders
menu > notication. Press the down arrow icon next to

Table 6. Error Codes and Reminders
Condition Issue Display System Action
Action to Clear / Recovery
Condition
Critical
Built-In Temp Sensor
error - temperature
sensor reads -4°F

5°F) or greater.
Temperature
Sensor
Error
• Indoor temp is
displayed as “--” on the
home screen.
• This error is displayed

screen as well.
• If the sensor starts detecting
a normal operating range, the
error message will automatically
clear and the system will return
to normal operation.
• Contact service contractor to
replace the CS8500.
Critical
Remote temperature
sensor error. External
sensor reads -4°F

5°F) or greater.
External
Sensor
Error
• Indoor temp is
displayed as “--” on the
home screen.
• This error is displayed

screen as well.
• 
external temperature
sensors and there
is an error, the unit
will automatically
switch to the internal
temperature sensor.
• If the sensor starts detecting
a normal operating range, the
error message will automatically
clear and the system will return
to normal operation.
• Contact service contractor
to replace the external
temperature sensor.
• Other than replacing the
CS8500, go to the technician
setting > temperature sensor
cong. and change the
temperature sensor source back
to internal temperature sensor.
That will remove the error
message from the home and
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