LG ARUV Series Service Manual page 236

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 sec.
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
short or (red-white, red-yellow, red-orange, red-blue)
2. If the estimated resistance value is in 52 ± 3Ω
misconnection
then the EEV is normal
1. Check the resistance between coil terminal
(brown-white, brown-yellow, brown-orange, brown-blue)
2. If the estimated resistance value is in 150 ± 10Ω
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 estimated temperature is very low in comparison with
suction temperature which is displayed at remote
controller then the valve is not fully closed
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Only for training and service purposes
Diagnosis
1K LED
- 236 -
Repair process Unit
Check and replace Indoor
Indoor unit control unit
board
Replace EEV Indoor
/ Outdoor
unit
Replace EEV Outdoor
unit
Replace EEV Indoor
unit
If the amount of Indoor
leakage is much, unit
Replace EEV
LGE Internal Use Only