Fujitsu AB*G30LRTE series, Service Instruction

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Trouble shooting 13
OUTDOOR UNIT Error Method:
Indicate or Display:
Detective Actuators: Detective details:
Forecast of Cause :
OK OK
Compressor Thermistor Error
Outdoor unit Main PCB
Compressor temperature thermistor
When Compressor 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.
02-15
Refer to error code table.
17.8 26.3
20
40.0
62.5 79.1 100.9 129.8 168.6 Resistance value (k )
15 10
1013.1
-30
531.6
-20
292.9
-10
221.1
-5 5 0 Temperature (°C )
12.3
30 50 40 60
2.0 3.4 4.6 6.3 8.7 Resistance value (k )
120 100 90 80 70 Temperature (°C )
OK OK
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.
BROWN
BROWN
Thermistor
(Discharge pipe)
Thermistor
(Heat exchanger)
Thermistor
(Outdoor temp.)
Thermistor
(Compressor temp.)
3
2
1
3
2
1
CN64
BLUE
BLUE
3
2
1
3
2
1
CN62
BLACK
BLACK
3
2
1
3
2
1
CN65
BROWN
BROWN
3
2
1
3
2
1
CN63