Troubleshooting Guide
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Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
01 Indoor unit air sensor error
02 Indoor unit pipe inlet 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(50°F) = 20.7kΩ : 25°C(77°F)= 10kΩ : 50°C(122°F)= 3.4kΩ
Pipe temp sensor: 10°C(50°F) = 10kΩ : 25°C(77°F)= 5kΩ : 50°C(122°F)= 1.8kΩ
■ Error diagnosis and countermeasure flow chart
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
CN-ROOM : Indoor air temp sensor
CN-PIPE2 : Pipe outlet temp sensor
CN-PIPE1 : Pipe inlet temp sensor
Measure the resistance of outlet pipe temp sensor.
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