Lennox 14HPX User Manual

Page 10
TABLE 2
DS2
Green
DS1
Red
Condition/Code Possible Cause(s) Solution
OFF OFF Power problem No power (24V) to control termi-
nals R & C or board failure.
1.
Check control transformer power (24V).
2.
If power is available to board and LED(s) do
not light, replace board.
Simultaneous
SLOW Flash
Normal operation Unit operating normally or in
standby mode.
None required.
Alternating
SLOW Flash
5−minute anti−short cycle
delay
Initial power up, safety trip, end of
room thermostat demand.
None required (Jumper TEST pins to override)
Simultaneous
FAST Flash
Ambient Sensor Problem 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).
Alternating
FAST Flash
Coil Sensor Problem 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).
ON ON Circuit Board Failure Indicates that control has internal component failure. Cycle 24 volt power to board.
If code does not clear, replace control.
FAULT & LOCKOUT CODES (Each fault adds 1 strike to that code’s counter; 5 strikes per code = LOCKOUT)
OFF SLOW
Flash
Low Pressure Fault
1.
Restricted air flow over indoor
or outdoor coil.
2.
Improper refrigerant charge in
1.
Remove any blockages or restrictions from
coils and/or fans. Check indoor and outdoor
fan motor for proper current draws.
2
OFF ON Low Pressure LOCKOUT
Improper
refrigerant
charge
in
system.
3.
Improper metering device
installed or incorrect operation
fan
motor
for
proper
current
draws.
2.
Check system charge using approach & sub-
cooling temperatures.
3.
Check system operating pressures and
SLOW
Flash
OFF High Pressure Fault
i
ns
t
a
ll
e
d
or
i
ncorrec
t
opera
ti
on
of metering device.
4.
Incorrect or improper sensor
location or connection to s
y
s-
3
.
Ch
ec
k
sys
t
em opera
ti
ng pressures an
d
compare to unit charging charts.
4.
Make sure all pressure switches and sensors
have secure connections to s
y
stem to prevent
ON OFF High Pressure LOCKOUT
location
or
connection
to
sys
tem.
have
secure
connections
to
system
to
prevent
refrigerant leaks or errors in pressure and
temperature measurements.

Lennox 14HPX Specifications

General

Compressor	Single-stage
Refrigerant	R-410A
Energy Star Certified	Yes
Cooling Capacity (BTU/h)	18, 000 - 60, 000
Operating Temperature Range (Cooling)	Up to 125°F
Sound Rating	76 dB
Efficiency Rating	Up to 14 SEER
HSPF	8.2