Fujitsu AMUG24LMAS Service Manual page 86

Troubleshooting 27(Continued)
Check Point 1 : Check connection of Connector
Check if connector is removed.
Check erroneous connection.
Check if thermistor cable is open.
>> Upon correcting the removed connector or mis-wiring, reset the power.
Check Point 2 : Check thermistor of indoor unit
Isn't it fallen off the holder?
Is there a cable pinched?
>> Check characteristics of thermistor. (Refer to Troubleshooting 11, 12),
If defective, replace the thermistor.
Check Point 3 : Check the solenoid coil and 4-way valve
[ Solenoid coil ]
Remove connector (AOU24/30RGLX:CN500, AOUG36/48LMAS1:CN202)
from PCB and check the resistance value of coil.
Resistance value is about 1355 ±135Ω (24/30), 2085 ±208.5Ω (36/48)
>> 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 4 : Replace main PCB
If Check Point 1- 3 do not improve the symptom, replace Main PCB.
OK OK
OK OK
OK OK
03-38