Lennox ComfortSense 8500 Installation And Setup Manual page 30

Condition Issue
CO Sensor error
2
- sensor reads
Critical out of range
(above 3500
ppm)
Comm error
Critical state at start-
up.
Some RTU
Critical compressors
Locked
Table 10. Error Codes
Display System Action
The reading for CO2
is not valid. This
message indicates
CO2 sensor is not
working correctly.
CO Sensor
The display of Indoor
2
Error
CO from HOME will
2
be "--".
This error is displayed
on the notification
screen as well
When the failed (off-
line) state is detected,
continue listening for a
valid message.
Comm Status
If this occurs then
– Errors
normal operation
Detected
should resume.
This error is displayed
in notification
screen.
This error is displayed
Some RTU
in notification screen
Compressors
and technician system
Locked
status screen.
30
Action to Clear / Recovery
Condition
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
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.
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.