Lennox iComfort SL18XC-01 Installer Setup Manual page 33

Table 1. Alert Codes and Troubleshooting
Alert
Priority Alert Text
Code
Moderate / The inverter has detected a PFC circuit
431
Critical over­current condition.
Moderate / The inverter has detected a DC link high
432
Critical voltage condition.
Moderate /
433 Compressor phase current is too high.
Critical
Moderate / Outdoor control has lost communications
434
Critical with the inverter for greater than 3 minutes.
Moderate /
435 Inverter internal error.
Critical
Moderate / Inverter heat sink temperature exceeded
436
Critical limit.
Heat sink temperature sensor fault has oc­
Moderate /
437 curred (temperature less than 4 ºF or great­
Critical
er than 264ºF after 10 minutes of operation).
Moderate / The inverter has detected a PFC circuit
438
Critical over­current condition.
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.
Steps to clear
Error occurs when PFC detects a over current condition of 100A peak. If condition is de­
tected, outdoor unit will stop (compressor and fan). Anti­short cycle is initiated. If condition
occurs 10 times within an hour, system will lockout. To clear, disconnect power to outdoor
unit and restart.
Error occurs when the DC link capacitor voltage is greater than 480VDC. If condition is
detected, outdoor unit will stop (compressor and fan). Anti­short cycle is initiated. If condi­
tion occurs 10 times within an hour, system will lockout. System will stop. To clear, discon­
nect power to outdoor unit and restart.
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, out­
door unit will stop (compressor and fan). Anti­short cycle is initiated. If condition occurs 5
times within an hour, system will lockout. To clear disconnect power to outdoor unit and
restart.
This error will occur when communication check­sum error occurs for 3 minutes. Outdoor
control will stop all compressor demands, recycle power to the inverter by de­energizing
the contactor for 2 minutes.
When this error occurs, the outdoor control will cycle power to the inverter by opening the
contactor for 2 minutes. Outdoor control will cycle power to the inverter 3 times and then
outdoor unit is locked out.
This occurs when the heat sink temperature exceeds the inverter limit. Inverter will issue
code 13 first and slow down to try to cool the heat since. If temperature remains high,
outdoor unit will stop (compressor and fan). Anti­short cycle is initiated. If condition occurs
5 times within an hour, system will lockout. System will stop. To clear, disconnect power to
outdoor unit and restart.
This occurs when the temperature sensor detects a temperature less than 0.4ºF or great­
er than 264ºF after 10 minutes of operation. If condition is detected, outdoor unit will stop
(compressor and fan). Anti­short cycle is initiated. If condition occurs 5 times within an
hour, system will lockout. To clear disconnect power to outdoor unit and restart.
Error occurs when PFC detects an input over current condition of 35A peak. If condition is
detected, outdoor unit will stop (compressor and fan). Anti­short cycle is initiated. If condi­
tion occurs 10 times within an hour, system will lockout. To clear, disconnect power to
outdoor unit and restart.
33 iComfort Wi‐Fi
®
7-Day Programmable Communicating Thermostat