Lennox Error Code 428

Priority condition: Service Soon/Service Urgent The inverter has detected a high main input current condition. • If condition is detected, outdoor unit will stop (compressor and fan) – moderate condition. • Anti-short cycle is initiated. • If condition occurs 10 times within an hour, system will lockout – critical condition. • Inverter LEDs will flash code 22. • Refer to the unit service documentation for detailed troubleshooting procedures. Priority condition: Service Soon/Service Urgent Inverter flash code 22. Priority condition: Service Soon/Service Urgent The sequence is: • Red LED: Two Flashes • Green LED: Two Flashes NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED is OFF.