Lennox iComfort Wi-Fi Setup Manual page 56

Table 10. Alert Codes and Troubleshooting
Alert PRIORITY
Code CONDITION
400 Critical
401 Moderate
402 Critical
403 Moderate
404 Critical
405 Critical
507343-01
APPLICABLE
SYSTEM ALERT TEXT
COMPONENTS
The compressor internal over­
Outdoor unit
load has tripped.
Either the compressor ran for
more than 18 hours continu­
ously trying to cool the home
Outdoor unit
during a single demand or the
refrigerant pressure in the sys­
tem is low.
Either the discharge or suction
pressure level is out-of-limits,
Outdoor unit
or the compressor has over­
loaded.
The compressor ran for less
than three minutes to satisfy a
Outdoor unit
thermostat demand.
The compressor rotor is locked
Outdoor unit
up.
The compressor circuit is open.
Outdoor Unit
Critical alerts are displayed on the Home screen, in the Home­
owner alert button, and in the Installer alert button. Minor and
moderate alerts are found only in the Installer alert button.
COMPONENT OR SYSTEM OPERA­
TIONAL STATE AND TROU­
BLESHOOTING TIP
•
Thermostat demand Y1 is
present; however compressor is
not running.
•
Check power to unit.
•
This alert code is automatically
cleared after current is sensed in
both RUN and START sensors
for at least two seconds or after
service is removed, or after pow­
er reset.
•
Alert code will not lockout system.
•
If the two-stage outdoor unit has:
•
An outdoor control with blinking
LED lights then the unit will run in
low speed;
•
An outdoor control with a 7-seg­
ment display, the outdoor control
will display alert code 401, but
continue to run in high speed.
•
If the outdoor unit is a heat pump,
and the outdoor temperature is
less than 65°F, alert code 401 is
ignored.
•
Also monitors low pressure
switch trips.
Check discharge or suction pressure.
•
This short cycle fault is triggered
when five compressor cycles last­
ed less than four minutes. The
compressor cycles could have
ended for any reason, thermostat
satisfied or high-pressure switch
for example.
•
Compressor rotor locked up due
to run capacitor short,
•
Bearings are seized
•
Excessive liquid refrigerant, etc.
(NOTE: May need to install hard
start kit).
Compressor circuit open (due to power
disconnection - open fuse, etc.)
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HOW TO CLEAR
ALERT CODE
Automatically clears
when the system de­
tects that the issue no
longer exists.
Automatically clears
after 30 consecutive
normal run cycles or
power reset.
Automatically clears
after four consecutive
normal compressor
run cycles.
Automatically clears
after four consecutive
normal compressor
run cycles.
NOTE: Code removed
from outdoor control -
Part # 103369-03 and
later / Cat # 11H36
Kit).
Automatically clears
after four consecutive
normal run cycles or
after power reset.
Automatically clears
after one normal com­
pressor run cycle.