Lennox Error Code 431

Priority condition: Service Soon/Service Urgent 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. • Anti-short cycle timer is initiated. • If condition occurs 10 times within 60 consecutive minutes, the system will lockout – critical condition. • Inverter LEDs will flash code 27. • Refer to the unit service documentation for detailed troubleshooting procedures. Priority condition: Service Soon/Service Urgent Inverter flash code 27. Priority condition: Service Soon/Service Urgent The sequence is: • Red LED: Two Flashes • Green LED: Seven Flashes NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED is OFF.