Lennox iComfort S30 Installation And Setup Manual page 69

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
437
Critical outdoor unit*
Moderate / Inverter based
438
Critical outdoor unit*
Inverter based
439 Moderate
outdoor unit*
Inverter based
440 Moderate
outdoor unit*
Table 18. Alert Codes and Troubleshooting
Actual
Displayed Alert Component or System Operational State and Troubleshooting Tip
Text
Heat sink temperature sensor fault has occurred (temperature less than 4ºF or greater than
264ºF after 10 minutes of operation)
• When the temperature sensor detects a temperature less than 4ºF or greater than 264ºF after
10 minutes of operation.
OD Inverter
• Outdoor unit will stop both compressor and fan – moderate condition.
Heat-Sink temp
Sensor Fault • Anti-short cycle is initiated.
• If condition occurs five times within an hour, system will lockout – critical condition.
• Inverter LEDs will blink code 65.
• Refer to the unit service documentation for detailed troubleshooting procedures.
The inverter has detected a PFC circuit over-current condition
• The inverter has detected a power factor correction (PFC) over current condition. This may be
caused by a high load condition, high pressure, or outdoor fan failure.
• Outdoor control will display the code when the inverter has detected the error – moderate
condition.
OD Inverter
• After three minutes, the inverter will reset and the compressor will resume operation.
PFC Input
• If the error condition occurs 10 times within a 60 minute rolling time period, the outdoor unit
Overcurrent
control will lock out operation of the outdoor unit – critical condition.
• Possible issue is system running at high pressures.
• Check for high pressure trips or other alert codes in thermostat and outdoor control.
• Inverter LEDs will blink code 73.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Compressor slowdown due to high input current.
• Input current is approaching a high limit.
OD Inverter
• Compressor speed will automatically slow down. The outdoor control will continue sending the
Compressor
inverter speed demanded by the thermostat.
Slowdown
• The outdoor control will set indoor CFM and outdoor RPM to values according to demand
- High Input
percentage rather than the actual Hz.
Current
• Inverter LEDs will blink code 12.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Compressor slowdown due to high heat sink temperature.
• Heat sink temperature is approaching limit.
• The compressor speed automatically slows to reduce heat sink temperature.
• The control sets indoor CFM and outdoor RPM to values according to demand percentage
OD Inverter
rather than the actual Hz.
Compressor
• Feedback from supplier tear down of inverter indicates that the screws that hold the inverter to
Slowdown -
the inverter board were loose causing poor contact between these two components.
High Heat-Sink
temperature
• Tighten screws that hold the heat sink to the inverter control board.
NOTE: Wait five minutes for all capacitors to discharge before checking screws.
• Inverter LEDs will blink code 13.
• Refer to the unit service documentation for detailed troubleshooting procedures.
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69
How to clear alert code
Moderate priority condition will
automatically clear when the
inverter sends an alarm clear
message.
Critical priority condition can be
cleared by disconnecting and
reconnecting power to outdoor
unit to restart.
Moderate priority condition is
automatically cleared when the
inverter sends a clear mes-
sage.
Critical priority condition will
automatically clear when inverter
is power cycled.
Automatically clears when the
condition no longer exists.
Automatically clears when the
condition no longer exists.