140 141
_TROUBLE SHOOTING GUIDE BOOK _
- 156 -
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?*
Check and correct connection
Replace sensor
Replace outdoor unit PCB
Yes
Yes
No
No
* Measuring input voltage
* Noise filter wiring
R(L1) S(L2) T(L3) N
* Sensor resistance 100 kΩ over (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
194*
Master
1941
Slave1
1942
Slave2
1943
Slave3
1944
Outdoor unit Fan PCB
heatsink temperature
sensor error
Outdoor unit Fan PCB
heatsink temperature
sensor error
1. Defective temperature sensor connection
2. Defective temperature sensor (Open / Short)
3. Defective outdoor unit PCB
Error No. Error Type Error Point Main Reasons
194*
Outdoor unit Fan
PCB heatsink
temperature sensor
error
Outdoor unit Fan
PCB heatsink
temperature sensor
error
1. Defective temperature sensor connection
2. Defective temperature sensor(Open / Short)
3. Defective outdoor unit PCB
▒
Error Diagnosis and Countermeasure Flow Chart
- 155 -
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 Fan PCB Screw Connection Condition
Error No. Error Type Error Point Main Reasons
193*
Master
1931
Slave1
1932
Slave2
1933
Slave3
1934
Fan PCB Heatsink
Temperature High
Heatsink Temperature
is Over 90°C
1. Fan PCBA IPM Connection Condition Abnormal
2. Outdoor Unit Fan Motor Operation Abnormal
3. Outdoor Unit Fan 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 Fan PCBA Screw Connection Condition
Reassemble or Manage if abnormality Found
No
Fan PCB IPM 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 Fan PCB Assembly
No
Is Fan PCB assembly
Normal?
Yes
Recheck Power and
Installation Condition
Yes
Check Screw Connection Condition
Error No. Error Type Error Point Main Reasons
193*
Fan PCB Heatsink
Temperature High
Heatsink Tempera
-
ture is Over 90℃
1. Fan PCBA IPM Connection Condition Ab
-
normal
2. Outdoor Unit Fan Motor Operation Abnormal
3. Outdoor Unit Fan PCB Assembly Defect
4. Overload Operation (Pipe Clogging/ Cover
-
ing/EEV Defect/Ref. Overcharge)
▒
Error Diagnosis and Countermeasure Flow Chart
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