Fujitsu AO*G09KXCA Series, Service Instruction

Page: 55 / 110

Trouble shooting 18
OUTDOOR UNIT Error Method:
Detective Actuators: Detective details:
Forecast of Cause :
OK OK
OK OK
16.1
5
20.7 26.9 35.2 46.6 62.3 115.2 Resistance value (k )
0 -5 -10 -20
224.3
-30 Temperature (°C ) 10 15
1.7 2.4 3.5 5.2 8.0 Resistance value (k )
70
1.2
80 60 50 40 30
12.6
20 Temperature (°C )
Outdoor Thermistor Error
Outdoor unit Main PCB
Outdoor temperature thermistor
When Outdoor temperature thermistor open or short-circuit
is detected at power ON or while running the compressor.
1. Connector connection failure 2. Thermistor failure 3. Main PCB failure
Check Point 1 : Check connection of connector
Check if connector is removed.
Check if connector is erroneous connection.
Check if thermistor cable is open.
>> Upon correcting the removed connector or mis-wiring, reset the power.
Check Point 2 : Remove connector and check thermistor resistance value
Thermistor characteristics (Approx. value)
If Thermistor is either open or shorted, replace it and reset the power.
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V)
If the voltage does not appear, replace Main PCB.
02-22
BLACK
BLACK
Thermistor (Outdoor temp.) 1
2
3 1
2
3
P5
Indicate or Display:
Indoor Unit :
Operation indicator : 7 times Flash
Timer indicator : 4 times Flash
Error code : [ E: 74 ]
Economy indicator: Continuous Flash