LG ARUV Series Service Manual page 278

Troubleshooting Guide
Error No. Error Type
113 (Main)
Outdoor unit liquid pipe
125 (Sub1)
(condenser) temperature
137 (Sub2)
sensor error
166 (Sub3)
Error No.
114 (Main sub-cool inlet)
115 (Main sub-cool outlet)
126 (Sub1 sub-cool inlet)
127 (Sub1 sub-cool outlet)
138 (Sub2 sub-cool inlet)
139 (Sub2 sub-cool outlet)
167 Sub3 sub-cool inlet)
168 (Sub3 sub-cool outlet)
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
Abnormal sensor resistance value
(Open/Short)
Error Type
Outdoor unit sub-cooling
inlet / outlet temperature
sensor error
No
Check and correct connection
No
Replace sensor
Error Point
1. Defective temperature sensor con-
2. Defective temperature sensor
3. Defective outdoor unit PCB
Error Point
1. Defective temperature sensor con-
Abnormal sensor resis-
2. Defective temperature sensor
tance value
(Open/Short)
3. Defective outdoor PCB
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Main Reasons
nection
(Open / Short)
Main Reasons
necter connection
(Open/Short)
LGE Internal Use Only