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Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Checking Method for Key Components
• EEV failure check method
Failure mode
Diagnosis
Repair process
Unit
Microcomputer
Driving circuit
failure
1.Disconnect the EEV connector form control board and
connect testing LED
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
Check and replace
Indoor unit control
board
Indoor
unit
EEV locking
1.If EEV is locked, in no load state, the driving motor rotate,
and clicking sound always occurs
Replace EEV
Indoor
/ Outdoor
unit
EEV Motor coil
short or
misconnection
1. Check the resistance between coil terminal
(red-white, red-yellow, red-orange, red-blue)
2. If the estimated resistance value is in 52
±
3
Ω
then the EEV is normal
Replace EEV
Outdoor
unit
1. Check the resistance between coil terminal
(brown-white, brown-yellow, brown-orange, brown-blue)
2. If the estimated resistance value is in 150
±
10
Ω
then the EEV is normal
Replace EEV
Indoor
unit
1. Operate indoor unit with FAN mode and operate another
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
If the amount of
leakage is much,
Replace EEV
Indoor
unit
Full closing
(valve leakage)
1K
LED
Summary of Contents for ARNU07GB1G1
Page 338: ...P NO 3828A24006P FEBRUARY 2009 ...
