Lennox Signature XC17 Installation Instructions Manual page 37

Outdoor Main
Control LEDs
DS15 DS13
Yellow Red
OFF ON
1 Flashes
then
OFF
Pause
2 Flashes
then OFF
Pause
3 Flashes
then OFF
Pause
4 Flashes
then OFF
Pause.
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Table 10. Compressor LED Alert Codes
Possible
Condition
Cause(s)
Thermostat
Compressor demand signal Y1
Internal is present, but
Overload Trip compressor not
running
Compressor is
running extremely
Long run time.
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
Locked Rotor short, bearings
are seized, ex-
cessive liquid re-
frigerant.
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Solution
1
Compressor protector is open.
S
Check for high head pressure
S
Check compressor supply voltage
2
Outdoor unit power disconnect is open.
3
Compressor circuit breaker or fuse(s) is open.
4
Broken wire or connector is not making contact.
5
Low or high pressure switch open if present in the
system.
6
Compressor contactor has failed to close.
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 circuit
3
Evaporator coil is frozen.
S
Check for low suction pressure
S
Check for excessively low thermostat setting
S
Check evaporator airflow (coil blockages or return
air filter)
S
Check ductwork or registers for blockage.
4
Faulty metering device.
S
Check TXV bulb installation (size, location and
contact)
S
Check if TXV/fixed orifice is stuck closed or de-
fective
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 cir-
cuit
S
Check thermostat installation (location 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 blockage
4
Return air duct has substantial leakage.
1
Thermostat demand signal is intermittent.
2
Time delay relay or Main Control 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 compressor.
4
Compressor bearings are seized.
Page 37
Clearing Status
Clears the error after current
is sensed in the run and
start winding for two
seconds, service removed
or power reset.
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 SERIES