Fujitsu Comfort Series Service Manual page 38

Troubleshooting 12
OUTDOOR UNIT Error Method:
Expansion valve Thermistor Error
Detective Actuators:
Expansion valve temperature thermistor
Forecast of Cause :
1. Connector connection defective, 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 5".
OK
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Main PCB (P10:1-2) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.
Expansion valve temperature thermistor
If the voltage do not appear, replace Main PCB If the voltage do not appear,
the check operation again.
Indicate or Display:
Green 7 flash / Red 8 flash
Detective details:
1 2 3
1 2 3
P10
(P10:1-2)
, and execute
Expansion valve temperature thermistor short or open detected
03-13
Outdoor unit : No indication
DC