LG ACHH Series Manual page 75

Error number Errors
42 Sensor error of
(421) low pressure
43 Sensor error of
(431) high pressure
n Failure diagnosis method
Is a sensor normally
connected to PCB?
Yes
Is it normal after replacing
PCB?
Yes
Terminated
Pressure sensor connector
Meaning
Abnormal value of sensor
(Open/Short)
Abnormal value of sensor
(Open/Short)
Insert a sensor to PCB
Correspond pressure sensor
No
replacement
Low pressure sensor
High pressure sensor
Main cause of occurrence
1. Bad connection of low pressure connector
2. Defect of low pressure connector (Open/Short)
3. Defect of outdoor PCB
1. Bad connection of high pressure connector
2. Defect of high pressure connector (Open/Short)
3. Defect of outdoor PCB
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Error code check