Fujitsu AUXB04GALH Service Manual page 190

SERVICE PARTS INFORMATION 8-2
Indoor Unit Electronic Expansion Valve
(EEV)
Check Point 1 : Check Connections
Check Connectors (Loose connector or open cable.)
Cassette (AUXK018 - 030GLAH,
Compact Floor (AG*A004 - 014GCAH)
Compact Wall mount (AS*A004 - 009GTAH)
Wall mount (AS*A030GTAH)
Compact Slim Duct (ARXK04 - 24GCLH)
Check Point 5 : Check Opening and Closing Operation of Valve
When Valve is closed,
it has a temp. difference between Inlet and Outlet.
CLOSE
Example : Hot Gas
Pipe (In)
Check Point 6 : Check Strainer
Strainer normally does not have temperature difference between inlet and outlet as shown in (1), but if there is a difference
as shown in (2), there is a possibility of inside clogged. In this case, replace Strainer.
(1)
Pipe (In)
AUXM018 - 030GLAH)
Pipe (Out)
Pipe (Out)
Check Point 2 : Check Coil of EEV
Remove connector, check each winding resistance of Coil.
Read wire Resistance value (20°C)
White - Red
Yellow - Red
Orange - Red
Blue - Red
If Resistance value is abnormal, replace EEV.
Check Point 3 : Check Noise at start up
Turn on Power and check operation noise.
>> If an abnormal noise does not show, replace Controller PCB.
Check Point 4 : Check Voltage from Controller PCB
Remove Connector and check Voltage (DC12V).
>> If it does not appear, replace Controller PCB.
If it is open,
it has no temp. difference between Inlet and Outlet.
OPEN
Example : Hot Gas
Pipe (In)
(2)
Pipe (In)
04-120
46 ± 10%
Pipe (Out)
Pipe (Out)
DC