LG UU85W U74 - Troubleshooting Indoor Error

Part 4 Trouble Shooting
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6.5 Troubleshooting Indoor Error
CH 01 (Indoor unit air sensor error
CH 02 (Indoor unit pipe inlet sensor error
CH 06 (Indoor unit pipe outlet sensor error)
01 Indoor unit air sensor error
02 Indoor unit pipe intake sensor error
06 Indoor unit pipe outlet sensor error
Error
No.
Error Type Error Point Main Reasons
Indoor unit sensor is
open/short
1. Indoor unit PCB wrong connection
2. Indoor unit PCB failure
3. Sensor problem (main reason)
** In case the value is more than 100kΩ (open) or less than 100Ω (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 = 20.7kΩ : 25°C= 10kΩ : 50°C= 3.4kΩ
Pipe temp sensor: 10°C = 10kΩ : 25°C= 5kΩ : 50°C= 1.8kΩ
■ Error diagnosis and countermeasure flow chart
Measure the resistance
of outlet pipe temp
sensor.
CN-ROOM
CN-PIPE/OUT
CN-PIPE/IN
Is sensor properly
connected to PCB?
Is the resistance value
of sensor normal?*
Connect properly to PCB
Change the sensor
Change the PCB
Yes
Yes
No
No