Fujitsu ARTG30LHTA Service Instruction page 47

Trouble shooting 14
OUTDOOR UNIT Error Method:
Heat Ex. Outlet Temp.
Thermistor Error
Detective Actuators:
Heat exchanger liquid 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 8".
OK
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Main PCB (CN63:1-2) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.
Heat exchanger outlet temperature thermistor (CN63:1-2)
If the voltage does not appear, If the voltage does not appear, replace Main PCB
the check operation again.
Indicate or Display:
Refer to error code table.
Detective details:
Heat exchanger outlet temperature thermistor short or open detected
1 2 3 4 5
1 2 3 4 5
CN63
DC
, and execute
02-17