Fujitsu AR G07LL A Series Service Instruction page 51

Trouble shooting 18
OUTDOOR UNIT Error Method:
Compressor Thermistor Error
Detective Actuators:
Outdoor Unit Main PCB Circuit
Compressor Temperature Thermistor
Forecast of Cause :
1. Connector connection failure 2. Thermistor failure 3. Main PCB failure
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.
OK OK
Check Point 2 : Remove connector and check Thermistor resistance value
Check Point 2 :
Thermistor Characteristics (Rough value)
Temperature(°C)
Resistance Value (k )
Temperature(°C)
Resistance Value (k )
If Thermistor is either open or shorted, replace it and reset the power.
OK OK
Check Point 3 :
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.
Indicate or Display:
Refer to error code table.
Detective details:
When Compressor Temperature Thermistor open or short-circuit is
detected at power ON or while running the compressor.
-30 -20 -10
1013.1 531.6 292.9 168.6
60 70 80
12.3 8.7 6.3
02-20
0 10 20 30
100.9 62.5 40.0
90 100 110 120
4.6 3.4 2.6 2.0
40 50
26.3 17.8