Fujitsu AUXB04GALH Service Manual page 195

SERVICE PARTS INFORMATION 12
4-WAY VALVE
Check Point 1 : Check Circuit connection
Check the connection of connector CN 105
SOLENOID COIL 4WV
Check Point 3: Check Operation of 4 Way Valve
Check each piping temperature, and confirm the location of the valve by the temperature difference.
Heating Operation Heating Operation
4WAY VALVE
ON
SOLENOID COIL
If the valve location is not proper, replace 4 way valve.
Check Point 4: Check Voltage from Controller PCB
Remove connector and check the voltage (Rated AC voltage).
>> If the voltage does not appear, replace Controller PCB.
BLUE
1 1
BLUE
2 2
HOT GAS
HOT GAS
AC
Check Point 2 : Check Solenoid Coil
Remove CN6 from PCB and check the resistance value
of coil
If it is Open or abnormal resistance value, replace
Solenoid Coil
HOT GAS
Cooling Operation Cooling Operation
4WAY VALVE
OFF
SOLENOID COIL
04-125
Resistance Value
1.7K
HOT GAS
AC