Lennox Error Code 433

Priority condition: Service Soon/Service Urgent Compressor phase current is too high. • During initial startup, a six minute time delay is implement to prevent the alarm from occurring. • Error occurs when compressor peak phase current is greater than 28 amps. • Inverter will issue inverter code 14 first and slow down to try to reduce the current. • If the current remains high, outdoor unit will stop (compressor and fan) – moderate condition. • Cycle timer is initiated. • If condition occurs five times within 60 consecutive minutes, the system will lockout – critical condition. • This alert code may be triggered by the inverter or the Lennox variable capacity outdoor (inverter controlled) unit. • Lennox outdoor control may trigger an this alert code if the inverter reduces the compressor speed which is identified as a alert code 441 and the compressor speed (in hz) is below the minimum speed. This will typically occur at start-up. The inverter automatically increases the compressor minimum speed below 45ºF in the heating mode and above 115ºF ensure the compressor capacity is sufficient for oil return. If alert code 433 occurs and inverter does not indicate an inverter code 29, the Lennox communicating Lennox outdoor control triggered the alert code 433. > Check the Lennox outdoor control software version by accessing the outdoor unit diagnostics section of the icomfort communicating thermostat. The Lennox outdoor control with software versions 1.27 and later have updated software that includes a six minute time delay during the cooling mode and a 11 minute delay during the heating mode after receiving an alert code 433, which typically occurs during start-up. > If the system is connected to the Internet, the Lennox outdoor control can be updated over the Internet. Make sure the software “auto update” is enabled. The software “auto update” can be toggled to prompt the Lennox server to update the thermostat which will update the Lennox outdoor control. If the system is not connected to the Internet, replace the Lennox outdoor control with catalog number 17D27 or newer version. • Inverter LEDs will flash code 29. • Refer to the unit service documentation for detailed troubleshooting procedures. Priority condition: Service Soon/Service Urgent Inverter flash code 29. Priority condition: Service Soon/Service Urgent The sequence is: • Red LED: Two Flashes • Green LED: Nine Flashes NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED is OFF.