Lennox ComfortSense 8500 Series Installation And Setup Manual page 25

Condition Issue
2
CO Sensor error
- sensor reads out
Critical
of range (above
3500 ppm)
Comm error state
Critical
at start-up.
Some RTU
Critical compressors
Locked
Table 6. Error Codes and Reminders
Display System Action
• The reading for CO
is not valid. This
message indicates
2
CO
working correctly.
2
CO Sensor
• The display of Indoor
Error
2
CO
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
on the notification
screen as well.
This error is displayed
Some RTU
in notification screen
Compressors
and technician system
Locked
status screens.
25
Action to Clear / Recovery
Condition
2
• Contact service contractor to
sensor is not
replace the CS8500.
• If the sensor starts detecting
a normal operating range, the
error message will automatically
from HOME will
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.