Lennox Error Code 436

Priority condition: Service Soon/Service Urgent Inverter heat sink temperature exceeded limit. • This occurs when the heat sink temperature exceeds the inverter limit. Inverter will issue inverter alert code 13 first and slow down to try to cool the heat sink. • If temperature remains high, outdoor unit will stop both compressor and fan – moderate condition. • Anti- short cycle is initiated. • If condition occurs five times within an hour, system will lockout – critical condition. • The screws that hold the inverter to the inverter board were loose causing poor contact between these two components. • 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 flash code 62. • Refer to the unit service documentation for detailed troubleshooting procedures. Priority condition: Service Soon/Service Urgent Inverter flash code 62. Priority condition: Service Soon/Service Urgent The sequence is: • Red LED: Six 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.