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_TROUBLE SHOOTING GUIDE BOOK _
- 136 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
n Error diagnosis and countermeasure flow chart
Is temperature sensor
connector connections
are normal?
Is the value of temperature
sensor resistance normal?*
Connect sensor connector to PCB
Replace sensor
Replace outdoor unit PCB
Yes
Yes
No
No
* 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
Error No. Error Type Error Point Main Reasons
65*
Master
651
Slave1
652
Slave2
653
Slave3
654
Inverter PCB Power
Module sensor error
Abnormal sensor resis-
tance value
(Open/Short)
1. Defective temperature sensor connection
2. Defective temperature sensor (Open / Short)
3. Defective outdoor unit PCB
Error No. Error Type Error Point Main Reasons
65*
Inverter PCB Power
Module sensor
error
Abnormal sensor
resistance value
(Open/Short)
1. Defective temperature sensor connection
2. Defective temperature sensor(Open / Short)
3. Defective outdoor unit PCB
- 135 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
n
Error diagnosis and countermeasure flow chart
n Check Inverter PCB Screw Connection Condition
Error No. Error Type Error Point Main Reasons
62*
Master 621
Slave1 622
Slave2 623
Slave3 624
Inverter PCB Heatsink
Temperature High
Heatsink Temperature
is Over 90°C
1. Inverter PCB IGBTM Connection Condition
Abnormal
2. Outdoor Unit Fan Motor Operation Abnormal
3. Outdoor Unit Inverter PCB Assembly Defect
4. Overload Operation (Pipe Clogging/ Covering/EEV
Defect/Ref. Overcharge)
Is Installation
Condition Normal?
No
1. Check Pipe Clogging/ Distortion
2. Check Covering (Outdoor/Indoor Unit)
3. Check EEV Connector Assemble Condition/Normal Operation
4. Check Refrigerant Pressure
5. Check Power Wire/ Connection Condition
Reassemble or Manage if abnormality Found
1. Check Inverter PCBA Screw Connection Condition
Reassemble or Manage if abnormality Found
No
Inverter PCB IGBTM Connection
Condition Normal?
Yes
1. Check Outdoor Unit Fan Motor Operation or Lock
Reassemble or Manage if abnormality Found
No
Is ODU Fan Motor Normal?
Yes
1. Reset
Replace Inverter PCB Assembly
No
Is Inverter PCB assembly
Normal?
Yes
Recheck Power and
Installation Condition
Yes
❈ Check screw connection condition
Error No. Error Type Error Point Main Reasons
62*
Inverter PCB Heat
-
sink Temperature
High
Heatsink Tempera
-
ture is Over 90℃
1. Inverter PCB IGBTM Connection Condition
Abnormal
2. Outdoor Unit Fan Motor Operation Abnormal
3. Outdoor Unit Inverter PCB Assembly Defect
4. Overload Operation (Pipe Clogging/ Cover
-
ing/EEV Defect/Ref. Overcharge)
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