LG Multi V5 Service Manual page 129

Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and service
WARNING
troubleshooting of the Multi V product.
Table 71: Error Codes, continued.
Error Code
Excessive increase in master outdoor unit inverter com-
3 2 1
pressor1 gas discharge temperature.
Excessive increase in slave1 outdoor unit inverter com-
3 2 2
pressor1 gas discharge temperature.
Excessive increase in slave2 outdoor unit inverter com-
3 2 3
pressor1 gas discharge temperature.
Excessive increase in master outdoor unit inverter com-
3 3 1
pressor2 gas discharge temperature.
Excessive increase in slave1 outdoor unit inverter com-
3 3 2
pressor2 gas discharge temperature.
Excessive increase in slave2 outdoor unit inverter com-
3 3 3
pressor2 gas discharge temperature.
Master outdoor unit compressor high pressure safety
3 4 1
tripped.
Slave1 outdoor unit compressor high pressure safety
3 4 2
tripped.
Slave2 outdoor unit compressor high pressure safety
3 4 3
tripped.
Master outdoor unit low side pressure below allowable
3 5 1
limits.
Slave1 outdoor unit low side pressure below allowable
3 5 2
limits.
Slave1 outdoor unit low side pressure below allowable
3 5 3
limits.
1 Master outdoor unit inverter 1 or inverter 2 low compres-
3 6
sion ratio.
Slave1 outdoor unit inverter 1 or inverter 2 low compres-
3 6 2
sion ratio.
Slave2 outdoor unit inverter 1 or inverter 2 low com-
3 6 3
pression ratio.
Master outdoor unit inverter compressor current trans-
4 0 1
ducer (CT) sensor error.
Slave1 outdoor unit inverter compressor current trans-
4 0 2
ducer (CT) sensor error.
Slave2 outdoor unit inverter compressor current trans-
4 0 3
ducer (CT) sensor error.
1 Master outdoor unit inverter compressor1 discharge
4 1
pipe temperature sensor error.
Slave1 outdoor unit inverter compressor1 discharge
4 1 2
pipe temperature sensor error.
Slave2 outdoor unit inverter compressor1 discharge
4 1 3
pipe temperature sensor error.
Description
Due to our policy of continuous product innovation, some specifications may change without notification.
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ERROR CODE TABLES
Details
• System shutdown happens when discharge pipe temperature
rises >115°C (239°F) for 10 seconds, or compressor dome
temperature equals 105°C (221°F) for 10 seconds.
• Check the inverter compressor discharge pipe temperature
sensor.
• Check for low refrigerant / leaks.
• Check for a defective EEV.
• Check for a defective liquid spray valve.
• Shutdown due to if one compressor's high pressure is >4,000
kPa (580 psi) for ten (10) seconds.
• Check the high pressure sensor, indoor unit or outdoor unit
fan(s), refrigerant, EEV, service valve (may be clogged); check
for defective outdoor unit PCB, indoor unit pipe temperature
sensor, or hot gas valve. Also, outdoor unit may not have
enough clearance (cooling operation), or indoor unit filter may
be clogged (heating operation).
• System will shut down when an abnormal low pressure condi-
tion occurs.
• Shut down occurs when the sum of all compressors inverter
frequency <30Hz = low <110 kPa for 1 minute.
• When operating in cooling mode: Low side pressure <400
kPa for 1 minute; High side pressure is <2,200 kPa. Check for
refrigerant leaks (low refrigerant charge), or a defective indoor
unit EEV.
• When operating in heating mode: Low side pressure <230
kPa for 1 minute; High side pressure is <1,800 kPa. Check
for refrigerant leaks (low refrigerant charge), or a defective
outdoor unit EEV.
• Outdoor unit is experiencing a problem developing compressor
lift. Error is calling out low compression ratio. System will shut
down and display error code "CH36*".
• During ongoing operation, if the compression ratio is <1.6 for
2 to 5 minutes following a change in position of the reversing
valve (either direction). If compression ratio is <1.6, delay 5
minutes for condition to correct itself before raising the error.
• During low ambient cooling operation following an initial
compressor start, if compression ratio is <1.1 for 2 minutes, if
compression ratio is <1.3 for 3 minutes.
Master outdoor unit inverter compressor current transducer (CT)
detection sensor disconnected, shorted, or opened.
Slave1 outdoor unit inverter compressor current transducer (CT)
detection sensor disconnected, shorted, or opened.
Slave2 outdoor unit inverter compressor current transducer (CT)
detection sensor disconnected, shorted, or opened.
• Error can also occur if the system is operating in cooling at
extremely low temperatures with no low ambient kit.
• Compressor discharge pipe temperature sensor (TH3) is not
installed or connected properly.
• Defective compressor discharge pipe sensor (TH3) (opened or
shorted);
• Defective outdoor unit PCB.
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