Lennox Collection XC21 System Installation Instructions Manual page 41

Air Conditioner
icomfort icomfort
Control LEDs
Touch Touch
Thermostat Thermostat
DS15 DS13
Display Display
Yellow Red
4 flashes Critical Alert
Off
then pause Code 404
5 flashes Critical Alert
Off
then pause Code 405
6 flashes Critical Alert
Off
then pause Code 406
7 flashes Critical Alert
Off
then pause Code 407
8 flashes Critical Alert
Off
then pause Code 408
Moderate/
9 flashes
Off Critical Alert
then pause
Code 409
Fast simultaneous flashing of DS11,
DS13, DS14 and DS15
1. Pause duration is two (2) seconds.
2. Fast flash duration is 1/2 second. Slow flash duration is one (1) second.
Initially a moderate status is displayed and is escalated to critical if alarm exists for more than 10 minutes.
3.
® ®
Possible Possible
Condition Condition
Cause(s) Cause(s)
Compressor has
a locked out due
to run capacitor
Locked rotor short, bearings
are seized,
excessive liquid
refrigerant.
Compressor has
an open circuit
due to power
disconnection,
Open circuit
fuse is open or
other similar
conditions.
Current not
Open start
sensed by Start
circuit
transformer.
Current not
Open run
sensed by run
circuit
transformer.
Welded Compressor
contactor always runs
Secondary low 24VAC is below
3
voltage 18VAC.
OEM mode Factory test mode.
Solution Solution
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.
1
Outdoor unit power disconnect is open.
2
Unit circuit breaker or fuse(s) is open.
3
Unit contactor has failed to close.
S
Check compressor contactor wiring and
connectors
S
Check for compressor contactor failure
(burned, pitted or open)
S
Check wiring and connectors between
supply and compressor
S
Check for low pilot voltage at compressor
contactor coil
4
High pressure switch is open and requires
manual reset.
5
Open circuit in compressor supply wiring or
connections.
6
Unusually long compressor protector reset time
due to extreme ambient temperature.
7
Compressor windings are damaged.
S
Check compressor
resistance
1
Run capacitor has failed.
2
Open circuit in compressor start wiring or
connections.
S
Check wiring and connectors between
supply and the compressor S terminal
3
Compressor start winding is damaged.
S
Check compressor
resistance
1
Open circuit in compressor start wiring or
connections.
S
Check wiring and connectors between
supply and the compressor R terminal
2
Compressor start winding is damaged.
S
Check compressor
resistance
1
Compressor contactor failed to open.
2
Thermostat demand signal not connected to
module.
1
Control circuit transformer is overloaded.
2
Low line voltage (contact utility if voltage at
disconnect is low).
S
Check wiring connections
Page 41
Clearing Status Clearing Status
Clears after power
reset or four normal
compressor cycles.
Clears after one
normal compressor
run cycle or power
reset.
motor winding
Clears when
amperage is
detected in RUN
and START
sensors, or after
power reset.
motor winding
Clears when
amperage is
detected in RUN
and START
sensors, or after
motor winding
power reset.
Clears after one
normal compressor
run cycle or after
power reset.
Clears after voltage
is higher than
20VAC for two
seconds, or after
power reset.
XC21 SERIES