LG MULTI V Service Manual page 94

Checking Method for Key Components
• EEV failure check method
Failure mode
Microcomputer 1.Disconnect the EEV connector form control board and
Driving circuit connect testing LED
failure
2. Main power ON, pulse signal is out from EEV for 17 seconds
If LEDs do not turn on, or are in on state continuously,
then driving circuit is abnormal
EEV locking 1.If EEV is locked, in no load state, the driving motor rotate,
and clicking sound always occurs
EEV Motor coil
1. Check the resistance between coil terminal (Red-White,
Red-Orange, Brow-Yellow, Brown-Blue)
short or
misconnection
1. Sub cooling EEV : Check the resistance between coil
terminal (Red-White, Red-Yellow, Red-Orange, Red-Blue)
2. If the measured resistance value is in 52 Ω ± 3 %
(@ 20 ℃[68 ℉]), then the EEV is normal.
1. Main / VI EEV : Check the resistance between coil
terminal (Red-White, Red-Orange, Brown-Yellow, Brown-
Blue)
2. If the measured resistance value is in 150 Ω ± 10 %, then
the EEV is normal.
Full closing 1. Operate indoor unit with FAN mode and operate another
(valve leakage) indoor unit with COOLING mode
2. Check indoor unit(FAN mode) liquid pipe temperature
(from operation monitor of outdoor unit control board)
3. When fan rotate and EEV is fully closed, if there is any
leakage, then the temperature is down
If measured temperature is very low in comparison with
suction temperature which is displayed at remote
controller then the valve is not fully closed
Incomplete 1. Check the Pin fully engaged into connector and check the
Connector color of electric wire
connection 2. After removing the connector on the control board and
or assembly check with tester.
Diagnosis
1 KΩ LED
- 94 -
Repair process
Check and replace
Indoor unit control
board
Replace EEV
Replace EEV
Replace EEV coil
Replace EEV
If the amount of
leakage is much,
Replace EEV
Check
the incorrectly
connected part
Copyright © 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.
Unit
Indoor
unit
Indoor
/ Outdoor
unit
Indoor
Unit
Outdoor
Unit
Outdoor
Unit
Indoor
unit
Outdoor
Unit
Indoor
Unit