71
XC20
Intelligent Power Module
Converter
Heat Sink
Power Factor
Correction
Circuit
Communication Control
Figure 52. 4- and 5-Ton Unit Inverter
STATUS CODES:
Table 17. 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/de
humidification). 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 LED Flash
Code (number of
flashes)
Priority Alarm Description Possible Causes and Clearing Alarm
Red LED
Green
LED
N/A ON OFF N/A XC 20-024 and -036 only: Indicates inverter is operating normally.
N/A ON ON N/A XC 20-048 and -060 only: Indicates inverter is operating normally.
N/A OFF OFF N/A Indicates inverter is NOT energized.
ERROR CODES:
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 423 40 4 flashes OFF
Moderate
/ Critical
The inverter has detected a
circuit problem.
Control will lock out after 10 strikes within an hour. To
clear disconnect power to outdoor unit and restart.
E 426 N/A N/A N/A Critical Excessive inverter alarms
After ten faults within one hour, control will lock out.
Indicates poor system operation. Review history of
alarms to resolve system setup. Check condenser fan
motor, TXV, indoor unit blower motor, stuck reversing
valve, over-charge, undercharge, and clogged refriger
ant filter.
To clear error, disconnect power to outdoor unit and re
start. Inverter alarms 12 to 14 and 53 do not count to
wards this lock out condition.
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