Lennox XC21 User Manual

Page 35
XC21 SERIES
Outdoor A175 Main
Control LEDs
Solution
Possible
Cause(s)
Condition
icomfort
Toucht
Thermostat
Display
DS11
Green
Solution
Possible
Cause(s)
Condition
icomfort
Toucht
Thermostat
Display
DS14 Red
DS11
Green
Solution
Possible
Cause(s)
Condition
icomfort
Toucht
Thermostat
Display
DS14 Red
OFF
1 Fast
Flash then
Pause
Not Applicable
Heating Low
Capacity
These are codes that show status of operation whether in low stage or high stage,
heating or cooling, defrost or in the EDA mode.
OFF
2 Fast
Flash then
Pause
Not Applicable
Heating High
Capacity
ON
2 Fast
Flash then
Pause
Not Applicable Defrost
1 Fast
Flash then
Pause
OFF Not Applicable
Cooling Low
Capacity
2 Fast
Flash then
Pause
OFF Not Applicable
Cooling High
Capacity
2 Fast
Flash then
Pause
ON Not Applicable
Dehumidification
Mode
ALERT STATUS
NONE NONE
Moderate Alert
Code 105
Device
Communication
Failure
icomfort Toucht thermostat device is unable to communicate with any other
device on the RSBus. Alarm only occurs if a specific device did communicate
initially after power up and communication was later lost. Possible causes are
lost connection, bus short or open, or other device stop responding.
NONE NONE
Moderate Alert
Code 120
Unresponsive
Device
Message could be sent by any device on RSBus if expected response message
is not received from other device. If sent by indoor or outdoor control, device did
not get expected response (incorrect or no response at all) from active Subnet
controller. If sent by the icomfort Toucht thermostat, and did not get the
expected response (incorrect or no response at all) from device. Normally this
indicate device malfunction.
NONE NONE
Critical Alert
Code 124
Active subnet
controller missing
Device lost connection to icomfort Toucht thermostat. Thermostat is sending
heartbeat message in one minute intervals. Device sets this alarm if no
Heartbeat is received for three minutes. Normally this indicate lost connection to
thermostat, or thermostat is not working. Alert will clear after valid subnet
controller message is received.
NONE NONE
Critical Alert
Code 125
Hardware Failure
Entire or partial system failure. Alert will clear 300 seconds after fault has recov-
ered.
NONE NONE
Moderate /
Critical Alert
Code 126
Internal control
communication
failure
Internal communication on outdoor control. Alert will clear 300 seconds after
fault has recovered.
NONE NONE
Critical Alert
Code 131
Corrupted Control
Parameters
System stored configuration data is corrupted. System will not run. Refer to
communicating thermostat for memory corrupt handling.
NONE NONE
Critical Alert
Code 132
Failed Flash CRC
check.
No operations, A175 control enters boot loader mode. Alarm will clears after
reset.

Lennox XC21 Specifications

General

SEER Rating	up to 21.00
Sound Rating	as low as 69 dB
Refrigerant	R-410A
Energy Star Certified	Yes
Compressor Type	Two-Stage
Cooling Capacity (BTU/h)	24000-54000
Warranty	10-Year Limited Warranty on compressor