Lennox iComfort Wi-Fi Setup Manual page 64

Table 10. Alert Codes and Troubleshooting
Alert PRIORITY
Code CONDITION
Moderate /
436
Critical
Moderate /
437
Critical
Moderate /
438
Critical
507343-01
APPLICABLE
SYSTEM ALERT TEXT
COMPONENTS
Inverter heat sink temperature
Outdoor unit
exceeded limit
Heat sink temperature sensor
fault has occurred (temperature
Outdoor unit
less than 4 ºF or greater than
264ºF after 10 minutes of opera­
.
tion)
The inverter has detected a PFC
Outdoor unit
circuit over-current condition
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
•
This occurs when the heat sink
temperature exceeds the inverter
limit. Inverter will issue inverter
alert code 13 first and slow down
to try to cool the heat sink.
•
If temperature remains high, out­
door unit will stop both compres­
sor and fan – moderate condi­
tion.
•
Anti­short cycle is initiated.
•
If condition occurs five times with­
in an hour, system will lockout –
.
critical condition.
•
Feedback from supplier tear
down of inverter indicates that the
screws that hold the inverter to
the inverter board were loose
causing poor contact between
these two components.
•
Tighten screws that hold the heat
sink to the inverter control board.
NOTE: Wait five minutes to all capaci­
tor to discharge before checking
screws.
•
When the temperature sensor de­
tects a temperature less than
0.4ºF or greater than 264ºF after
10 minutes of operation.
•
Outdoor unit will stop both com­
pressor and fan – moderate con­
dition.
•
Anti­short cycle is initiated.
•
If condition occurs five times with­
in an hour, system will lockout –
critical condition.
•
The inverter has detected a pow­
er factor correction (PFC) over
current condition. This may be
caused by a high load condition,
high pressure, or outdoor fan fail­
ure.
•
Outdoor control will display the
code when the inverter has de­
tected the error – moderate con­
dition.
•
After three minutes, the inverter
will reset and the compressor will
.
resume operation.
•
If the error condition occurs 10
times within a 60 minute rolling
time period, the outdoor unit con­
trol will lock out operation of the
outdoor unit – critical condition.
•
Possible issue is system running
at high pressures.
•
Check for high pressure trips or
other alert codes in room thermo­
stat and outdoor control.
Page 64
BLESHOOTING TIP
HOW TO CLEAR
ALERT CODE
•
Moderate condition
will automatically
clear when the in­
verter sends an
alarm clear mes­
sage.
•
Critical condition is
cleared by discon­
necting power to
the outdoor unit
and restart.
•
Moderate priority
condition will auto­
matically clear
when the inverter
sends an alarm
clear message.
•
Critical priority con­
dition can be
cleared by discon­
necting and recon­
necting power to
outdoor unit to
restart.
•
Moderate priority
condition is auto­
matically cleared
when the inverter
sends a clear mes­
sage.
•
Critical priority con­
dition will automati­
cally clear when in­
verter is power cy­
cled.