Troubleshooting Guide - LG ARUN Series Service Manual

Outdoor unit multi v plus ii system

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Service manual (43 pages)

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Table of Contents

Error

Error Type

No.

Indoor unit air sensor error

Indoor unit pipe inlet sensor error

Indoor unit pipe outlet sensor error

I 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 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) = 20.7 kΩ, 25°C(76°F) = 10 kΩ, 50°C(122°F) = 3.4 kΩ

Pipe temp sensor: 10°C(50°F) = 10 kΩ, 25°C(76°F) = 5 kΩ, 50°C(122°F) = 1.8 kΩ

Only for training and service purposes

Indoor unit sensor is

Connect properly to PCB

Change the sensor

- 77 -

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-PIPE2 : Pipe outlet temp sensor

CN-PIPE1 : Pipe inlet temp sensor

Measure the resistance of outlet pipe temp sensor.