Lennox iComfort Wi-Fi Setup Manual page 65

Table 10. Alert Codes and Troubleshooting
Alert PRIORITY
Code CONDITION
Moderate
439
Moderate
440
Moderate
441
442 Critical
®
iComfort Wi-Fi
APPLICABLE
SYSTEM ALERT TEXT
COMPONENTS
Compressor slowdown due to
Outdoor unit
high input current.
Compressor slowdown due to
Outdoor unit
high heat sink temperature.
Compressor slowdown due to
Outdoor unit
high compressor current.
The top cap switch has opened
five times within one hour. As a
Outdoor unit
result, the outdoor unit is locked
.
out
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
•
Input current is approaching a
high limit.
•
Compressor speed will automati­
cally slow down. The outdoor
control will continue sending the
inverter speed demanded by the
thermostat.
•
The outdoor control will set indoor
CFM and outdoor RPM to values
according to demand percentage
rather than the actual Hz.
•
Heat sink temperature is ap­
proaching limit.
•
The compressor speed automati­
cally slows to reduce heat sink
temperature.
•
The control sets indoor CFM and
outdoor RPM to values according
to demand percentage rather than
the actual Hz.
•
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 ca­
pacitor to discharge before
checking screws.
•
Compressor slowdown due to
high compressor current.
•
Compressor current is approach­
ing limit.
•
The compressor speed automati­
cally slows.
•
The control sets indoor CFM and
outdoor RPM to values according
to demand percentage rather than
the actual Hz.
•
Possible issue is system running
at high pressures.
•
Check for high pressure trips or
other alert codes in room thermo­
stat and outdoor control.
•
This condition occurs when com­
pressor thermal protection sensor
opens five times within one hour.
•
Outdoor unit will stop.
7-Day Programmable Communicating Thermostat
Page 65
HOW TO CLEAR
ALERT CODE
Automatically clears
when the condition no
longer exists.
Automatically clears
when the condition no
longer exists.
Automatically clears
when the condition no
longer exists.
To clear, disconnect
power to outdoor unit
and restart.