Fujitsu AUXG45LRLB Service Instruction page 60

Trouble shooting 20
OUTDOOR UNIT Error Method:
Discharge Thermistor Error
Detective Actuators:
Discharge temperature thermistor
Forecast of C ause :
1. Connector connection failure, open
2. Thermistor failure
3. Main PCB failure
Check Point 1 : Check the connector connection and cable open
Connector connection state check
Cable open check
OK
Check Point 2 : Check the thermistor
Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 8".
OK
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Main PCB 30/36(CN63:1-2) 45/54(CN62:1-2) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.
[30/ 36]
Discharge temperature thermistor (
If the voltage does not appear, replace Main PCB
and execute the check operation again.
Indicate or Display:
Error code : 71
Detective details:
Discharge temperature thermistor short detected
Discharge thermistor open detected
3 2 1
3 2 1
CN63
CN63:1-3)
,
Outdoor unit : Model 45.54
PUMP
POWER
DOWN
ERROR
MODE L (
2
[45/ 54]
1 2 3 4
1 2 3 4
CN62
Discharge temperature thermistor (
02-22
LOW PEAK
NOISE CUT
) 1 L ( ) 2 (L3) (L4) (L5) L ( ) 6
7 1
CN62:1-2)
DC