Lennox icomfort Wi-Fi - Page 65

iComfort Wi-Fi
®
7-Day Programmable Communicating Thermostat
Page 65
Table 10. Alert Codes and Troubleshooting
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.
Alert
Code
PRIORITY
CONDITION
APPLICABLE
SYSTEM
COMPONENTS
ALERT TEXT
COMPONENT OR SYSTEM OPERA
TIONAL STATE AND TROU
BLESHOOTING TIP
HOW TO CLEAR
ALERT CODE
439
Moderate
Outdoor unit
Compressor slowdown due to
high input current.
 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.
Automatically clears
when the condition no
longer exists.
440
Moderate
Outdoor unit
Compressor slowdown due to
high heat sink temperature.
 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.
Automatically clears
when the condition no
longer exists.
441
Moderate
Outdoor unit
Compressor slowdown due to
high compressor current.
 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.
Automatically clears
when the condition no
longer exists.
442
Critical
Outdoor unit
The top cap switch has opened
five times within one hour. As a
result, the outdoor unit is locked
out.
 This condition occurs when com
pressor thermal protection sensor
opens five times within one hour.
 Outdoor unit will stop.
To clear, disconnect
power to outdoor unit
and restart.