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Checking Method for Key Components
• EEV failure check method
Failure mode
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
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All right reserved. Only for training and service purposes
Repair process
Unit
Replace EEV
Indoor
/ Outdoor
unit
Replace EEV
Indoor
Unit
Replace EEV coil
Outdoor
Unit
Replace EEV
Outdoor
Unit
If the amount of
Indoor
leakage is much,
unit
Replace EEV
Check
Outdoor
the incorrectly
Unit
connected part
Indoor
Unit
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