Fujitsu AU G18LVLB Series Service Instruction page 50

Split type room air conditioner
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Trouble shooting 21
OUTDOOR UNIT Error Method:
Discharge Thermistor Error
Detective Actuators:
Discharge temperature thermistor
Forecast of Cause :
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 P1 :3-4 voltage value =5V
Remove the thermistor from Main PCB, check the voltage.
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
4 3 2 1
4 3 2 1
P1
,
Outdoor unit : No indication
DC
02-22

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