Lennox XC20-036-230-01 Installation And Service Procedure page 58

Table 11. Outdoor Control 7-Segment Display Alert Codes - Compressor
System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only
the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert
codes are also displayed on the iComfort Wi-Fi
Inverter LED Flash
Code (number of
Alert Inverter
Code
Codes
Red LED
E 440 13 1 flash
E 441 14 1 flash
E 600 N/A N/A
XC20
®
thermostat..
Priority
flashes)
Green LED
3 flashes Moderate
4 flashes Moderate
N/A Critical
Alarm Description
Heat sink temperat­
ure is approaching
limit. The com­
pressor speed auto­
Issue: Feedback from supplier tear down of inverter indicates
matically slows to
that the screws that hold the inverter to the inverter board were
reduce heat sink
loose causing poor contact between these two components.
temperature. The
control sets indoor Corrective action: Tighten screws that hold the heat sink to the
CFM and outdoor inverter control board.
RPM to values ac­
NOTE: Wait 5 minutes to all capacitor to discharge before check­
cording to demand
ing screws.
percentage rather
than the actual Hz.
Alarm is automatic­
ally cleared.
Compressor slow­
down due to high
compressor current.
Compressor current
is approaching limit.
The compressor
Issue: Possible issue is system running at high pressures.
speed automatically
Check for high pressure trips or other alert codes in room ther­
slows. The control
sets indoor CFM mostat and outdoor control.
and outdoor RPM to
values according to
demand percentage
rather than the actu­
al Hz. Alarm is auto­
matically cleared..
Compressor has Load-shedding function: Provides a method for a local utility
been cycled OFF by
company to limit the maximum power level usage of the outdoor
utility load-shedding
unit. The feature is activated by applying 24 volts AC power to
function. the L and C terminals on the outdoor control.
58
Possible Causes and Clearing Alarm