LG Multi V - Page 101

Troubleshooting Guide
- 101 -
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Only for training and service purposes
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1. Defective temperature sensor connection
2. Defective temperature sensor (Open / Short)
3. Defective outdoor unit PCB
Error No. Error Type Error Point Main Reasons
Abnormal sensor resistance
value (Open/Short)
Outdoor unit liquid pipe
(condenser) temperature
sensor error
113
1. Defective temperature sensor connecter connec-
tion
2. Defective temperature sensor (Open/Short)
3. Defective outdoor PCB
Error No. Error Type Error Point Main Reasons
Abnormal sensor resistance
value (Open/Short)
Outdoor unit sub-cooling
inlet / outlet temperature
sensor error
114
■ 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
* 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(50°F) = 20.7kΩ : 25°C(77°F) = 10kΩ : 50°C(122°F)= 3.4kΩ
Pipe temperature sensor: 10°C(50°F) = 10kΩ : 25°C(77°F) = 5kΩ : 50°C(122°F)= 1.8kΩ