73
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 433 29 2 flashes 9 flashes
Moderate
/ Critical
The inverter has detected a
compressor over-current
condition.
Error occurs when compressor peak phase current is
greater than 28A. Inverter will issue code 14 first and slow
down to try to reduce the current. If the current remains
high, outdoor unit will stop (compressor and fan).
Antishort cycle is initiated. If condition occurs 5 times
within an hour, system will lock out. To clear disconnect
power to outdoor unit and restart.
E 434 53 5 flashes 3 flashes
Moderate /
Critical
Outdoor control has lost com
munications with the inverter
for greater than 3 minutes.
Outdoor control will stop all
compressor demands, re
cycle power to the inverter by
de-energizing the contactor
for 2 minutes. If this occurs 3
time in one thermostat call,
the outdoor unit will locked
out and display a critical
code.
Issues:
(1) Loose electrical connections.
(2) Interruption of main power to inverter.
Corrective Actions:
(1) Check all electrical connections.
(2) Check for proper main power to inverter.
E 435 60 6 flashes OFF
Moderate
/ Critical
Inverter internal error.
When this error occurs, the outdoor control will cycle
power to the inverter by opening the contactor for 2
minutes. Check that the EEPROM is properly seated.
After power is cycled to the inverter 3 times, the outdoor
unit is locked out.
E 436 62 6 flashes 2 flashes
Moderate /
Critical
Inverter heat sink temperat
ure exceeded limit. Occurs
when the heat sink temperat
ure exceeds the inverter limit.
Inverter issues code 13 first,
then slows down to allow the
heat sink to cool. If temperat
ure remains high, outdoor
unit stops (compressor and
fan). Anti-short cycle is initi
ated. If condition occurs 5
times within an hour, system
is locked out. To clear, dis
connect power to outdoor
unit and restart.
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 five minutes to all capacitor to discharge be
fore checking screws.
E 437 65 6 flashes 5 flashes
Moderate
/ Critical
Heat sink temperature
sensor fault has occurred
(temperature less than 4 ºF or
greater than 264ºF after 10
minutes of operation).
This occurs when the temperature sensor detects a tem
perature less than 0.4ºF or greater than 264ºF after 10
minutes of operation. If condition is detected, outdoor unit
will stop (compressor and fan). Antishort cycle is initi
ated. If condition occurs 5 times within an hour, system
will lock out. To clear disconnect power to outdoor unit
and restart. If problem persists, replace inverter.
E 438 73 7 flashes 3 flashes
Moderate /
Critical
The inverter has detected a
PFC over current condition.
This would be caused by a
high load condition, high
pressure, or outdoor fan fail
ure.Outdoor control will dis
play the code when the in
verter has the error. After 3
minutes, the inverter will re
set and the compressor will
turn on again. If it happens
10 times within a 60 minute
rolling time period, the OD
control will lock out operation
of the outdoor unit and dis
play a critical code.
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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