LG Multi V ARWM072CAS5 Service Manual page 147

Error
Error Type
No.
181
Master
1811
Water outlet temperature
Slave1
sensor error
1812
Slave2
1813
188*
Master
1881
Water inlet temperature
Slave1
sensor error
1882
Slave2
1883
n Error diagnosis and countermeasure flow chart
Is temperature sensor
connector connections
are normal?
Yes
Is the value of temperature
sensor resistance normal?*
Yes
Replace outside unit PCB
* Sensor resistance 100 k Ωover (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 = 20.7 kΩ : 25 °C = 10 kΩ : 50 °C = 3.4 kΩ
Pipe temperature sensor: 10 °C = 10 kΩ : 25 °C = 5 kΩ : 50 °C = 1.8 kΩ
Error Point
Abnormal sensor resistance
value (Open/Short)
Abnormal sensor resistance
value (Open/Short)
No
Check and correct connection
No
Replace sensor
- 147 -
Self-diagnosis function
Main Reasons
1. Defective temperature sensor connection
2. Defective temperature sensor (Open/Short)
3. Defective outdoor PCB
1. Defective temperature sensor connection
2. Defective temperature sensor (Open/Short)
3. Defective outdoor PCB
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