LG MULTI V Service Manual page 103

Error
Error Type
No.
01 Indoor unit air sensor error
02 Indoor unit pipe inlet sensor error
06 Indoor unit pipe outlet sensor error
n Error diagnosis and countermeasure flow chart
Is sensor properly
connected to PCB?
Yes
Is the resistance value
of sensor normal?*
Yes
Change the PCB
** In case the value is more than 100 kΩ (open) or less than 100 Ω (short), Error occurs
Refer: Resistance value maybe change according to temperature of temp sensor,
It shows according to criteria of current temperature(±5 % margin) ➔ Normal
Air temp sensor: 10 °C = 20.7 kΩ : 25 °C= 10 kΩ : 50 °C= 3.4 kΩ
Pipe temp sensor: 10 °C = 10 kΩ
Indoor unit sensor is
No
Connect properly to PCB
No
Change the sensor
: 25 °C= 5 kΩ : 50 °C= 1.8 kΩ
Error Point
1. Indoor unit PCB wrong connection
2. Indoor unit PCB failure
open/short
3. Sensor problem (main reason)
CN-ROOM : Indoor air temp sensor
CN-PIPE IN : Pipe inlet temp sensor
CN-PIPE OUT : Pipe outlet temp sensor
Measure the resistance of outlet pipe temp sensor.
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Self-diagnosis function
Main Reasons