Lennox XP17-024-230-01 Installation And Service Procedure page 15

System fault and lockout LED (DS11 / DS14) alarm codes takes precedence over system status LED codes (cooling, heating stages or
defrost/dehumidification). Only the latest active LED fault or lockout alarm code if present will be displayed. If no fault or lockout codes are active, then
system status LEDs are routinely displayed. See notes 1 and 2 in table below for duration of fast / slow flashes and pause.
Heat Pump Control
iComfortt iComfortt iComfortt
LEDs
-enabled -enabled -enabled
Thermostat Thermostat Thermostat
DS11 DS11
DS14 Red DS14 Red
Display Display Display
Green Green
1 fast flash
Off then
applicable
pause
2 fast
flashes
On
applicable
then
pause
1 fast flash
then
Off
applicable
pause
2 fast
flashes
On
applicable
then
pause
Moderate
None Alert Code
Moderate
None Alert Code
Critical Alert
None
Code 124
Critical Alert
None
Code 125
Moderate /
None Critical Alert
Code 126
Critical Alert
None
Code 131
Critical Alert
None
Code 132
Moderate
Off Alert Code
Slow flash
Critical Alert
Off On
Code 411
Moderate
Alert Code
Slow flash Off
Critical Alert
On Off
Code 413
XP17
Condition Condition Condition
Single stage
Not
compressor
heating
Not
Defrost
Single-stage
Not
compressor
cooling
Not Dehumidification
mode
Device
communication
105 failure
Unresponsive
device
120
Active subnet
controller missing
Hardware Failure
Internal control
communication
failure
Corrupted control
parameters
Failed flash CRC
check.
Low pressure
fault
410
Low pressure
switch lockout
High pressure
fault
412
High pressure
switch lockout
Possible Cause(s) Possible Cause(s) Possible Cause(s)
These are codes that show status of operation whether the system is operating in
either in first or second stage heating or cooling operation, defrost or in the
dehumidification modes.
ALERT STATUS
iComfortt-enabled thermostat 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.
Message could be sent by any device on RSBus if expected response message is
not received from other device. If sent by indoor or heat pump control, device did
not get expected response (incorrect or no response at all) from active Subnet
controller. If sent by the iiComfortt-enabled thermostat, and did not get the
expected response (incorrect or no response at all) from device. Normally this
indicate device malfunction.
Device lost connection to iComfortt-enabled 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.
Entire or partial system failure. Alert will clear 300 seconds after fault has
recovered.
Internal communication on heat pump control. Alert will clear 300 seconds after
fault has recovered.
System stored configuration data is corrupted. System will not run.
No operations, heat pump control enters boot loader mode. Alarm will clears after
reset. Refer to communicating thermostat for memory corrupt handling.
1
1
Restricted air flow over in­
door or outdoor coil.
2
Improper refrigerant
2
charge in system.
3
Improper metering device
3
installed or incorrect op­
eration of metering device.
4
4
Incorrect or improper sen­
sor location or connection
to system.
Page 15
Solution Solution Solution
Remove any blockages or restrictions from coils
and/or fans. Check indoor and outdoor fan motor
for proper current draws.
Check system charge using approach and sub­
cooling temperatures.
Check system operating pressures and compare
to unit charging charts.
Make sure all pressure switches and sensors
have secure connections to system to prevent
refrigerant leaks or errors in pressure and temper­
ature measurements.