LG MULTI V M ARNU07GTU 4 Series Svc Manual page 73

Error No. Error Type
Sensor error of
441
outdoor air
temperature
Piping temperature sensor
error of heat exchanger in
master & slave heat
451
exchanger module heat
exchanger (A,B)
Compressor
suction
461
temperature sensor
error
n Error diagnosis and countermeasure flow chart
Is sensor connected
to PCB correctly??
Yes
Is sensor value correct?*
Yes
For 441, 451 error Replace the
PCB of the Heat exchanger
module.
For 461 error Please replace
PCB of compressor module.
Error Point
Abnormal value of
sensor (Open/Short)
Abnormal value of
sensor
(Open/Short)
Abnormal value of
sensor (Open/Short)
No
Connect sensor to PCB correctly
No
Replace sensor
* If value is 100kΩ ↑(open) or 100Ω ↓(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
Sensor of piping temperature: 10°C = 10kΩ : 25°C= 5Ωk : 50°C= 1.8kΩ
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
: 25°C= 10kΩ : 50°C= 3.4kΩ
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