LG ACHH Series Manual page 76

Error code check
Error number Errors
Heat exchanger
45
pipe temperature
(451)
sensor error
Compressor suc-
46
tion temperature
(461)
sensor error
n Failure diagnosis method
Is a sensor normally
connected to PCB?
Yes
Is a resistance value of a
sensor normal? [Note 1]
Yes
Correspond PCB replacement
[Note 1] An error occurs in case of more than 100 kΩ (Open) or less than 100 Ω (Short)
Reference: A temperature sensor is normal if a resistance value changes depending upon the temperature and next resistance
value is shown based on the current temperature (±5% deviation)
Air temperature sensor: 10 ℃ = 20.7 kΩ : 25 ℃= 10 kΩ : 50 ℃= 3.4 kΩ
Pipe temperature sensor: 10 ℃ = 10 kΩ : 25 ℃= 5 kΩ : 50 ℃= 1.8 kΩ
Meaning
Resistance measurement
value of a sensor is abnor-
mal (Open/Short)
Resistance measurement
value of a sensor is abnor-
mal (Open/Short)
No
Insert a sensor to PCB
No
Sensor replacement
Main cause of occurrence
1. Temperature sensor connector connection defect
2. Temperature sensor defect (Open/Short)
3. PCB defect
1. Temperature sensor connector connection defect
2. Temperature sensor defect (Open/Short)
3. PCB defect
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