LG R410A Service Manual page 120

Checking Method for Key Components
• LEV failure check method
Failure mode
Microcomputer 1.Disconnect the LEV connector form control board and
Driving circuit connect testing LED
failure
2. Main power ON, pulse signal is out from LEV for 17 sec.
If LEDs do not turn on, or are in on state continuously,
then driving circuit is abnormal
LEV locking 1.If LEV is locked, in no load state, the driving motor rotate,
and clicking sound always occurs
LEV 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 LEV 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 LEV 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 LEV 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
120 Trouble Shooting Guide
Diagnosis
1K LED
Repair process Unit
Check and replace Indoor
Indoor unit control unit
board
Replace LEV Indoor
/ Outdoor
unit
Replace LEV Outdoor
unit
Replace LEV Indoor
unit
If the amount of Indoor
leakage is much, unit
Replace LEV