Lennox XC17 Series Unit Information page 39

Air Conditioner
icomfort icomfort
Control LEDs
Toucht Toucht
Thermostat Thermostat
DS15 DS13
Yellow Red Display Display
1 Flashes
Critical Alert
then OFF
Code 401
Pause
2 Flashes
Critical Alert
then OFF
Code 402
Pause
3 Flashes Moderate
then OFF Alert Code
Pause 403
4 Flashes
Critical Alert
then
OFF
Code 404
Pause.
Possible Possible
Condition Condition
Cause(s) Cause(s)
Compressor is
running extreme-
Long run time.
ly long run
cycles.
Indicates the
compressor
System
protector is open
Pressure Trip or missing supply
power to the
compressor.
Compressor is
Short Cycling running less than
three minutes.
Compressor has
a locked out due
to run capacitor
short, bearings
Locked Rotor
are seized, ex-
cessive liquid re-
frigerant.
Page 39
Solution Solution
1
Low refrigerant charge.
2
Evaporator blower is not running.
S
Check blower relay coil and contacts
S
Check blower motor capacitor
S
Check blower motor for failure or
blockage
S
Check evaporator blower wiring and
connectors
S
Check indoor blower control
S
Check thermostat wiring for open cir-
cuit
3
Evaporator coil is frozen.
S
Check for low suction pressure
S
Check for excessively low thermostat
setting
S
Check evaporator airflow (coil block-
ages or return air filter)
S
Check ductwork or registers for block-
age.
4
Faulty metering device.
S
Check TXV bulb installation (size,
location and contact)
S
Check if TXV/fixed orifice is stuck
closed or defective
5 .
Condenser coil is dirty
6
Liquid line restriction (filter drier blocked
.
if present)
7 .
Thermostat is malfunctioning
S
Check thermostat sub−base or wiring
for short circuit
S
Check thermostat installation (loca-
tion and level)
1
High head pressure.
S
Check high pressure switch if present
in system
S
Check if system is overcharged with
refrigerant
S
Check for non−condensable in system
2
Condenser coil poor air circulation (dirty,
blocked, damaged).
3
Condenser fan is not running.
S
Check fan capacitor
S
Check fan wiring and connectors
S
Check fan motor for failure or block-
age
4
Return air duct has substantial leakage.
1
Thermostat demand signal is intermit-
tent.
2
Time delay relay or air conditioner con-
trol (A175) is defective.
3
If high pressure switch is present, see
Flash Code 2 information.
1
Run capacitor has failed.
2
Low line voltage (contact utility if voltage
at disconnect is low).
S
Check wiring connections
3
Excessive liquid refrigerant in the com-
pressor.
4
Compressor bearings are seized.
Clearing Status Clearing Status
Clears the error after 30
consecutive normal run
cycles, or after power
reset.
Clears after four
consecutive normal
compressor run cycles,
or after power reset.
Clears after four
consecutive normal
compressor run cycles,
or after power reset.
Clears after power reset
or four normal
compressor cycles.
XC17