Lennox iComfort S30 Installation And Setup Manual page 67

Initial notification of critical alerts will pop up on the home screen and will be listed under notification menu. Minor and moderate alerts are found only under the notification menu.
* Current Lennox modulating outdoor units are XC20, XP20, XC25 and XP25.
Applicable
Alert Priority
System
Code Condition
Component(s)
Moderate / Inverter based
428
Critical outdoor unit*
Moderate / Inverter based
429
Critical outdoor unit*
Moderate / Inverter based
430
Critical outdoor unit*
Moderate / Inverter based
431
Critical outdoor unit*
Moderate / Inverter based
432
Critical outdoor unit*
Table 18. Alert Codes and Troubleshooting
Actual
Displayed Alert Component or System Operational State and Troubleshooting Tip
Text
The inverter has detected a high main input current condition
• If condition is detected, outdoor unit will stop (compressor and fan) – moderate condition.
OD Inverter
• Anti-short cycle is initiated.
High Main Input
• If condition occurs 10 times within an hour, system will lockout – critical condition.
Current
• Inverter LEDs will blink code 22.
• Refer to the unit service documentation for detailed troubleshooting procedures.
The inverter has detected a DC link low voltage condition
• On a call for compressor operation, if DC link power in inverter does not rise above 180 VDC
for 2- and 3-ton models, 250 VDC for 4- and 5-ton models within 30 seconds, the control will
display a moderate code.
• If condition is detected, outdoor unit will stop (compressor and fan) – moderate condition.
OD Inverter
• An anti-short cycle timer is initiated. If condition occurs 10 times within a 60 consecutive
DC Link Low
minutes, system will lock out and display alert code 429 – critical condition.
Voltage
• The outdoor control anti-short cycle timer will time out and the unit will recycle the demand.
• Replace outdoor inverter.
• Inverter LEDs will blink code 23.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Compressor start-up failure.
• If condition is detected, outdoor unit will stop (compressor and fan) – moderate condition.
• Anti-short cycle is initiated.
OD Inverter
Compressor
• If condition occurs 10 times within 60 consecutive minutes, the system will lockout – critical
Startup Fail
condition.
• Inverter LEDs will blink code 26.
• Refer to the unit service documentation for detailed troubleshooting procedures.
The inverter has detected a PFC circuit over-current condition
• Error occurs when PFC detects an over current condition of 100A peak.
• If condition is detected, outdoor unit will stop (compressor and fan) – moderate condition.
OD Inverter
• Anti-short cycle timer is initiated.
PFC Fault
• If condition occurs 10 times within 60 consecutive minutes, the system will lockout – critical
condition.
• Inverter LEDs will blink code 27.
• Refer to the unit service documentation for detailed troubleshooting procedures.
The inverter has detected a DC link high voltage condition.
• Error occurs when the DC link capacitor voltage is greater than 480VDC.
• If condition is detected, outdoor unit will stop (compressor and fan) – moderate condition.
OD Inverter
• Anti-short cycle timer is initiated.
DC Link High
• If condition occurs 10 times within 60 consecutive minutes, the system will lockout – critical
Voltage
condition.
• Inverter LEDs will blink code 28.
• Refer to the unit service documentation for detailed troubleshooting procedures.
.
.
.
67
How to clear alert code
To clear, disconnect power to
outdoor unit and restart.
Automatically clears when the
system detects that the issue no
longer exists.
To clear, disconnect power to
outdoor unit and restart.
To clear, disconnect power to
outdoor unit and restart.
To clear, disconnect power to
outdoor unit and restart.