Fujitsu AOUH18LPAS1, Service Manual

Page: 87 / 169

4-3. Outdoor unit Electronic Expansion Valve (EEV)
Check point 1. Check connections
Check connection of connector. (Loose connector or open cable)
NOTE: For details of wiring diagram, refer to "Wiring diagrams" in Chapter 2. TECHNICAL DATA
AND PARTS LIST on page 02-14.
Check point 2. Check coil of EEV
Remove connector, check each winding resistance of coil.
Read wire Resistance value
1 (Red)—2 (Blue)
46 Ω ±3.7 Ω
at 68 °F (20 °C)
1 (Red)—3 (Orange)
1 (Red)—4 (Yellow)
1 (Red)—5 (White)
→ If Resistance value is abnormal, replace EEV.
Check point 3. Check Voltage from main PCB
Remove connector and check voltage (DC 12 V)
→ If it does not appear, replace main PCB.
Check point 4. Check noise at start up
Turn on the power and check the operation noise.
→ If an abnormal noise does not show, replace main PCB.
Check point 5. Check Opening and Closing Operation of Valve
When valve is closed, it has a temp. difference
between inlet and outlet
Pipe (In)
Pipe (Out)
Hi TEMP.
Normal TEMP.
CLOSE
Example : Hot Gas
If it is open, it has no temp. difference between
inlet and outlet
Pipe (In)
Hi TEMP.
OPEN
Example : Hot Gas
Pipe (Out)
Hi TEMP.
4-3. Outdoor unit Electronic Expansion Valve (EEV)
- (03-51) -
4. Service parts information
TROUBLESHOOTING TROUBLESHOOTING