Troubleshooting Guide
- 90 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
■ Error diagnosis and countermeasure flow chart
1.
Bad connection of air temperature connector
2.
Defect of air temperature connector(Open/Short)
3. Defect of outdoor PCB
1.
Bad connection of air temperature connector
2. Defect of air temperature
connector(Open/Short)
3. Defect of outdoor PCB
Error
No.
Error Type Error Point Main Reasons
Abnormal value of sensor
(Open/Short)
Abnormal value of sensor
(Open/Short)
Sensor error of outdoor air
temperature
Outdoor unit heat exchang-
er temperature sensor error
44
45
1.
Bad connection of air temperature connector
2. Defect of air temperature
connector(Open/Short)
3. Defect of outdoor PCB
Abnormal value of sensor
(Open/Short)
Compressor suction tem-
perature sensor error
46
Is sensor connected
to PCB correctly??
Is sensor value correct?*
Connect sensor to PCB correctly
Replace sensor
Replace corresponding
outdoor unit PCB
Yes
No
No
Yes
* If value is 100kΩ ↑(open) or 100 Ω↓(short), error occurs
NB:
Resistance value of temperature sensor change according to
temperature
It is normal if value shown as below (±5% error)
Sensor of air temperature: 10°C(50°F) = 20.7kΩ : 25°C(77°F)= 10kΩ :
50°C(122°F)= 3.4kΩ
Sensor of piping temperature: 10°C(50°F) = 10kΩ : 25°C(77°F)= 5kΩ :
50°C(122°F)= 1.8kΩ
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