Lennox XP14 SERIES Unit Information page 9

DS2 DS1
Green Red
Condition/Code
OFF OFF Power problem
Simultaneous Normal operation
SLOW Flash
Alternating 5−minute anti−short cycle
SLOW Flash delay
Simultaneous Ambient Sensor Problem
FAST Flash
Alternating Coil Sensor Problem
FAST Flash
ON ON Circuit Board Failure
FAULT & LOCKOUT CODES (Each fault adds 1 strike to that code's counter; 5 strikes per code = LOCKOUT)
OFF SLOW Low Pressure Fault
Flash
OFF ON Low Pressure LOCKOUT
SLOW OFF High Pressure Fault
Flash
ON OFF High Pressure LOCKOUT
TABLE 2
Diagnostic Fault Code
Possible Cause(s)
No power (24V) to control termi-
nals R & C or board failure.
Unit operating normally or in
standby mode.
Initial power up, safety trip, end of
room thermostat demand.
Sensor being detected open or shorted or out of temperature range. Control will
revert to time/temperature defrost operation. (System will still heat or cool).
Sensor being detected open or shorted or out of temperature range. Control will not
perform demand or time/temperature defrost operation. (System will still heat or
cool).
Indicates that control has internal component failure. Cycle 24 volt power to control.
If code does not clear, replace control.
1
Restricted air flow over indoor or
outdoor coil.
2
Improper refrigerant charge in Improper refrigerant charge in
system.
3
Improper metering device
installed or incorrect operation installed or incorrect operation
of metering device.
4
Incorrect or improper sensor
location or connection to sys location or connection to sys-
tem.
Page 9
Solution
1
Check control transformer power (24V).
2
If power is available to control and LED(s) do
not light, replace board.
None required.
None required (Jumper TEST pins to override)
1
Remove any blockages or restrictions from
coils and/or fans. Check indoor and outdoor
fan motor for proper current draws. fan motor for proper current draws.
2 2
Check system charge using approach & sub-
cooling temperatures.
3 3
Check system operating pressures and Check system operating pressures and
compare to unit charging charts.
4
Make sure all pressure switches and sensors
have secure connections to system to prevent have secure connections to system to prevent
refrigerant leaks or errors in pressure and
temperature measurements.