74
XC20
Table 18. Outdoor Control 7-Segment Display Alert Codes and Inverter LED Flash Codes
NOTE - 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
®
or iComfort
®
S30 thermostat.
Alert
Codes
Inverter
Code
Inverter LED Flash
Code (number of
flashes)
Priority Alarm Description Possible Causes and Clearing Alarm
Red LED Green LED
E 439 12 1 flash 2 flashes Moderate
Compressor slowdown due
to high input current.
Input current is approaching a high limit. Compressor
speed will automatically slow down. The control contin
ues sending the inverter speed demanded by the thermo
stat. The control will set indoor CFM and outdoor RPM to
values according to demand percentage rather than the
actual Hz. Alarm is automatically clear.
E 440 13 1 flash 3 flashes Moderate
Heat sink temperature is ap
proaching limit. The com
pressor speed automatically
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. Alarm is
automatically cleared.
Issue: Feedback from supplier tear down of inverter in
dicates that the screws that hold the inverter to the invert
er board were loose causing poor contact between these
two components.
Corrective action: Tighten screws that hold the heat sink
to the inverter control board.
NOTE: Wait 5 minutes to all capacitor to discharge before
checking screws.
E 441 14 1 flash 4 flashes Moderate
Compressor slowdown due
to high compressor current.
Compressor current is ap
proaching limit. The com
pressor speed automatically
slows. The control sets in
door CFM and outdoor RPM
to values according to de
mand percentage rather than
the actual Hz. Alarm is auto
matically cleared..
Issue: Possible issue is system running at high pres
sures. Check for high pressure trips or other alert codes in
room thermostat and outdoor control.
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