Lennox · Communicating Systems
The power factor correction (PFC) circuit in the inverter has detected an over-current condition. This might be due to high system pressure or a fan issue. The system will attempt to reset after a few minutes. If it happens too often, the system will lock out.
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Check the thermostat and outdoor control for other alert codes indicating high pressure.
Moderate conditions should clear automatically. For critical conditions, power cycle the inverter.
Ensure the outdoor unit fan is operating correctly and not obstructed.