Lennox ComfortSense 8500 Series User Manual

25
Table 6. Error Codes and Reminders
Condition Issue Display System Action
Action to Clear / Recovery
Condition
Critical
CO Sensor error
- sensor reads out
of range (above
3500 ppm)
CO Sensor
Error
• The reading for CO
is not valid. This
message indicates
CO sensor is not
working correctly.
• The display of Indoor
CO from HOME will
be “--”.
• This error is displayed

screen as well.
• Contact service contractor to
replace the CS8500.
• If the sensor starts detecting
a normal operating range, the
error message will automatically
clear and the system will return
to normal operation
Critical
Comm error state
at start-up.
Comm Status
– Errors
Detected
• 󰀨
line) state is detected,
continue listening for a
valid message.
• If this occurs then
normal operation
should resume.
• This error is displayed

screen as well.
• Contact service contractor to
check communication wire
connection.
• If a valid message is received,
then the error message will
be automatically cleared and
system will resume normal
operations.
Critical
Some RTU
compressors
Locked
Some RTU
Compressors
Locked
This error is displayed

and technician system
status screens.
• User will have to contact the
Service Contractor to have the
system serviced.
• Will need to check RTU state
• If the RTU recovered from the
error automatically the error will
also automatically clear.

Lennox ComfortSense 8500 Series Specifications

General

Brand	Lennox
Model	ComfortSense 8500 Series
Category	Thermostat
Language	English