Lennox Error Code 438

Priority condition: Service Urgent The inverter has detected a power factor correction (PFC) circuit over-current condition. • The inverter has detected an 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. • After three minutes, the inverter will reset and the compressor will resume operation. • If the error condition occurs 10 times within a 60 minute rolling time period, the outdoor unit 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 flash code 73. • Refer to the unit service documentation for detailed troubleshooting procedures. Priority condition: Service Urgent Inverter flash code 73. Priority condition: Service Urgent The sequence is: • Red LED: Seven Flashes • Green LED: Three Flashes NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED is OFF.