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Table 21. 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
®
thermostat.
Alert
Codes
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 cur
rent.
Input current is approaching a high limit. Com
pressor speed will automatically slow down. The
control continues sending the inverter speed de
manded by the thermostat. The control will set in
door CFM and outdoor RPM to values according
to demand percentage rather than the actual Hz.
Alarm is automatically clear. See E428.
E 440 13 1 flash 3 flashes Moderate
Heat sink temperature is
approaching limit. The
compressor speed auto
matically slows to re
duce heat sink temperat
ure. The control sets in
door CFM and outdoor
RPM to values accord
ing to demand percent
age rather than the actu
al Hz. Alarm is automat
ically cleared.
Issue: Feedback from supplier tear down of invert
er indicates that the screws that hold the inverter to
the inverter 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 approaching
limit. The compressor
speed automatically
slows. The control sets
indoor CFM and outdoor
RPM to values accord
ing to demand percent
age rather than the actu
al Hz. Alarm is automat
ically cleared..
Issue: Possible issue is system running at high
pressures. Check for high pressure trips or other
alert codes in room thermostat and outdoor control.
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