Lennox Equipment not specified Error Code 440

Priority condition: Information Only-Dealer Compressor slowdown due to high heat sink temperature. • Heat sink temperature is approaching limit. • The compressor speed automatically slows to reduce heat sink temperature. • The control sets indoor CFM and outdoor RPM to values according to demand percentage rather than the actual Hz. • The screws that hold the inverter to the inverter board may be 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. • This error code is primarily for informational purposes as the inverter controls the compressor speed to operate within design parameters. Typically the inverter will make a minor speed reduction of 4 Hz (approximately a 5-6% speed reduction) for a brief period of time and to reduce the heat sink temperature and will then resume normal operation. This may occur at high outdoor temperatures (above 110ºF) for brief periods of time (3 – 4 minutes) and is normal and expected operation of the inverter controlling the compressor safely within design parameters. • The inverter finned aluminum heat sink is located on the back side of the inverter in the condenser air stream. If the alert code 440 occur frequently, especially at lower outdoor temperatures, check the heat sink for debris that may reduce heat transfer or possible obstructions that may impact air flow across the heat sink. • The inverter will begin to briefly reduce the compressor speed when the heat sink temperature rises above 185ºF and will allow the inverter to resume the requested compressor demand speed once the inverter heat sink reaches 176ºF. The heat sink temperature, compressor speed in Hertz & the Inverter Compressor Speed Reduction status (“On” or “Off ”) notification can be viewed under the outdoor unit Diagnostics section of the thermostat dealer control center. • Inverter LEDs will flash code 13. • Refer to the unit service documentation for detailed troubleshooting procedures. Priority condition: Information Only-Dealer Inverter flash code 13. Priority condition: Information Only-Dealer The sequence is: • Red LED: One Flash • 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.