Troubleshooting by Error Code SiUS331604E229 Service DiagnosisList of inverter-related error codesCode Name Condition for determining error Major causeCompressor current L5 Instantaneous overcurrent ofinverter compressor• Inverter output current exceeds 59.1 A eveninstantaneously.• Liquid sealing• Defective compressor• Defective inverter PCBL8 Overcurrent of invertercompressor(Electronic superheatingprotection sensor)• Compressor overload runningA current of 33.5 A or more continues for aperiod of consecutive 5 seconds or that of27.6 A or more continues for a period ofconsecutive 260 seconds.• The inverter loses synchronization.• Back-flow of compressor liquid• Sudden changes in loads• Disconnected compressor wiring• Defective PCBProtection device and othersE5 Inverter compressor lock • The compressor is in the locked status (doesnot rotate).• Defective compressorL1 Defective PCB (for invertercompressor)• No output is given. • Defective heavy current part ofcompressorL4 Radiation fin temperature rise • The radiation fin temperature reaches 87°C(188°F) or more (while in operation).• Defective fan• Running in overload for anextended period of time• Defective PCBL9 Defective startup of invertercompressor• The compressor motor fails to start up. • Liquid sealing or defectivecompressor• Excessive oil or refrigerant• Defective PCBLC Transmission error (betweenmicrocomputers on the outdoormain PCB)• No communications are carried out across themicrocomputers on the outdoor main PCB.• Defective outdoor main PCBP1 Imbalanced power supply • Power supply voltages get significantlyimbalanced among three phases.• Power supply error (imbalancedvoltages of 2% or more)• Defective PCB• Dead PCBP4 Defective radiation fin thermistor • The radiation fin thermistor gets short circuitedor open.• Defective radiation fin thermistorU2 Power supply voltage error • The inverter power supply voltage is high orlow.• Power supply error• Defective PCBCHECK 9
