Lennox XC21 Installation Instructions Manual page 36

Outdoor A175 Main
Control LEDs
DS11 DS11
DS14 Red DS14 Red
Green Green
SLOW Moderate Alert
OFF
Flash
Critical Alert
OFF ON
SLOW Moderate Alert
OFF
Flash
Critical Alert
ON OFF
SLOW Moderate Alert
ON
Flash
FAST Critical Alert
ON
Flash
Critical Alert
OFF Fast Flash
Fast simultaneous flashing of DS11, DS13,
DS14 and DS15
506518−01
icomfort icomfort icomfort
Toucht Toucht Toucht
Condition Condition Condition
Thermostat Thermostat Thermostat
Display Display Display
Low Pressure
Code 410 Fault
Low Pressure
Code 411 Switch Lockout
High Pressure
Code 412 Fault
High Pressure
Discharge Sensor
Code 413
Lockout
Discharge Line
Code 414 Temperature Fault
Discharge Line
Temperature
Code 415
Lockout
Moderate /
Discharge Sensor
Fault
Code 417
OEM Mode
Possible Possible Possible
Cause(s) Cause(s) Cause(s)
1
Restricted air
flow over indoor
or outdoor coil.
2
Improper refrig-
1
Remove any blockages or restrictions from coils and/or
erant charge in
fans. Check indoor and outdoor fan motor for proper cur-
system.
rent draws.
3
Improper meter-
2
Check system charge using approach and subcooling
ing device
temperatures.
installed or in-
3
Check system operating pressures and compare to unit
correct opera-
charging charts.
tion of metering
4
Make sure all pressure switches and sensors have se-
device.
cure connections to system to prevent refrigerant leaks or
4
Incorrect or im-
errors in pressure and temperature measurements.
proper sensor
location or con-
nection to sys-
tem.
This code detects high discharge temperatures. If the discharge line
temperature exceeds a temperature of 279ºF (137ºC) during compressor
operation, the control will de−energize the compressor contactor output (and the
defrost output if active). The compressor will remain off until the discharge
temperature has dropped below 225ºF (107ºC). See figure 21 for further details
concerning lockouts and reset procedures.
The A175 control detects open or short sensor or out of temperature sensor
range. This fault is detected by allowing the unit to run for 90 seconds before
checking sensor resistance. If the sensor resistance is not within range after 90
seconds, the control will raise the alarm.
Factory Test Mode.
Page 36
Solution Solution Solution