LG ARNU Series - Page 266

Troubleshooting Guide
- 266 -
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■ 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
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)
Abnormal value of
sensor (Open/Short)
Sensor error of
outdoor air temper-
ature
Piping temperature
sensor error of heat
exchanger in
main & sub outdoor
unit heat exchanger
(A,B)
Compressor suc-
tion temperature
sensor error
44 (Main)
118 (Sub1)
130 (Sub2)
159 (Sub3)
46 (Main)
120 (Sub1)
132 (Sub2)
161 (Sub3)
45 (Main H/E A)
48 (Main H/E B)
123 (Sub1 H/E A)
124 (Sub1 H/E B)
135 (Sub2 H/E A)
136 (Sub2 H/E B)
164 (Sub3 H/E A)
165 (Sub3 H/E B)
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 = 20.7kΩ : 25°C= 10kΩ : 50°C= 3.4kΩ
Sensor of piping temperature: 10°C = 10kΩ : 25°C= 5kΩ : 50°C= 1.8kΩ
Refer to CH41
Refer to CH45
Error No. Error Type Error Point Main Reasons
Abnormal value of
sensor (Open/Short)
Abnormal value of
sensor (Open/Short)
Discharge piping
temperature sensor
error of constant
compressor (Main
unit)
Piping temperature
sensor error of heat
exchanger in main
& sub outdoor unit
heat exchanger (B)
47
(constant com-
pressor of main
outdoor unit)
48
(Heat exchanger B)