LG MULTI V 5 Manual Book page 61

Error No. Error Type Error Point
Error No. Error Type Error Point
Inverter PCB Heat-
62*
Heatsink Tempera-
62* sink Temperature
Master 621
ture is Over 90℃
Inverter PCB Heatsink Heatsink Temperature
High
Slave1 622
Temperature High is Over 90°C
Slave2 623
Slave3 624
n Error diagnosis and countermeasure flow chart
1. Check Pipe Clogging/ Distortion
2. Check Covering (Outdoor/Indoor Unit)
No
Is Installation 3. Check EEV Connector Assemble Condition/Normal Operation
4. Check Refrigerant Pressure
Condition Normal?
5. Check Power Wire/ Connection Condition
Reassemble or Manage if abnormality Found
Yes
No
Inverter PCB IGBTM Connection 1. Check Inverter PCBA Screw Connection Condition
Condition Normal? Reassemble or Manage if abnormality Found
Yes
No
1. Check Outdoor Unit Fan Motor Operation or Lock
Is ODU Fan Motor Normal?
Reassemble or Manage if abnormality Found
Yes
No
Is Inverter PCB assembly 1. Reset
Normal? Replace Inverter PCB Assembly
Yes
Recheck Power and
Installation Condition
n Check Inverter PCB Screw Connection Condition
❈ Check screw connection condition
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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Main Reasons
Main Reasons
1. Inverter PCB IGBTM Connection Condition
Abnormal
1. Inverter PCB IGBTM Connection Condition
2. Outdoor Unit Fan Motor Operation Abnormal
Abnormal
3. Outdoor Unit Inverter PCB Assembly Defect
2. Outdoor Unit Fan Motor Operation Abnormal
4. Overload Operation (Pipe Clogging/ Cover-
3. Outdoor Unit Inverter PCB Assembly Defect
4. Overload Operation (Pipe Clogging/ Covering/EEV
ing/EEV Defect/Ref. Overcharge)
Defect/Ref. Overcharge)
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LGE Internal Use Only
Error No. Error Type Error Point
65*
Master
651
Slave1 Abnormal sensor resis-
Inverter PCB Power
652 tance value
Error No. Error Type Error Point
Module sensor error
Slave2 (Open/Short)
653
Inverter PCB Power Abnormal sensor
Slave3
65* Module sensor resistance value
654
error (Open/Short)
n Error diagnosis and countermeasure flow chart
Is temperature sensor
No
connector connections Connect sensor connector to PCB
are normal?
Yes
No
Is the value of temperature
Replace sensor
sensor resistance normal?*
Yes
Replace outdoor unit PCB
* Sensor resistance 100 kΩover (open) or 100 Ω below (short) will generate error
Note: Temperate sensor resistance vary with temperature, So compare temperature sensor resistance value
according to outdoor unit temperature by referring below table (±5% tolerance)
Air temperature sensor: 10°C = 20.7kΩ : 25°C = 10kΩ : 50°C= 3.4kΩ
Pipe temperature sensor: 10°C = 10kΩ : 25°C = 5kΩ : 50°C= 1.8kΩ
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Main Reasons
1. Defective temperature sensor connection
2. Defective temperature sensor (Open / Short)
Main Reasons
3. Defective outdoor unit PCB
1. Defective temperature sensor connection
2. Defective temperature sensor(Open / Short)
3. Defective outdoor unit PCB
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LGE Internal Use Only
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