Lennox Error Code 432

Priority condition: Service Soon/Service Urgent The inverter has detected a DC link high voltage condition. • Error occurs when the DC link capacitor voltage is greater than 480 VDC. • If condition is detected, outdoor unit will stop (compressor and fan) – moderate condition. • Anti-short cycle timer is initiated. • If condition occurs 10 times within 60 consecutive minutes, the system will lockout – critical condition. • Inverter LEDs will flash code 28. • Refer to the unit service documentation for detailed troubleshooting procedures. Priority condition: Service Soon/Service Urgent Inverter flash code 28., Priority condition: Service Soon/Service Urgent The sequence is: • Red LED: Two Flashes • Green LED: Eight Flashes NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED is OFF. Troubleshooting Suggestions: • Check wire connections (U, V and W) at inverter plug in harness and compressor. • Check the resistance of compressor windings. If not in range, replace compressor. • Check compressor to ground. If ground issue, replace compressor. • Check input power (Single Phase - 208/230VAC + 10%. If out of range, correct main power issue. • Check DC Link voltage and MICOM Sensing voltage. If out of range, replace inverter. if okay, possible mechanical issue with compressor. Go to outdoor unit service manual for detail troubleshooting procedures and require values for testing DC link voltages and various insulation resistance characteristics.