Fujitsu AUUH18LUAS Service Manual page 106

Check point 4. Check the solenoid coil and 4-way valve
NOTE: Refer solenoid coil and 4-way valve in
• Solenoid coil
Remove P60 from PCB and check the resistance value of coil. Resistance value is 1.970 kΩ (at
68°F [20°C]).
If it is open or abnormal resistance value, replace solenoid coil.
4-way valve
•
Check each piping temperature, and the location of the valve by the temperature difference.
If the value location is not proper, replace 4-way valve.
Check point 5. Replace main PCB
If Check Point 1 to 4 do not improve the symptom, replace main PCB.
2-32. E: 99.↓. 4-way valve error (Outdoor unit)
End
"Service parts information"
- (03-40) -
on page 03-53.
2. Troubleshooting with error code