LG Multi V Water IV ARNU07GTU 2 Series Service Manual page 91

Error
Error Type
No.
181
Master
(1811)
Slave1
Water temperature sensor
(1812)
error
Slave2
(1813)
Slave3
(1814)
■ Error diagnosis and countermeasure flow chart
Is temperature sensor
connector connections
are normal?
Yes
Is the value of temperature
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
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Only for training and service purposes
Error Point
Abnormal sensor resis-
tance value (Open/Short)
No
Check and correct connection
No
Replace sensor
1. Defective temperature sensor connection
2. Defective temperature sensor (Open/Short)
3. Defective outdoor PCB
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Troubleshooting Guide
Main Reasons
LGE Internal Use Only