Fujitsu AOYG45LAT8 User Manual page 90

Trouble shooting 25
OUTDOOR UNIT Error Method:
Heat Ex. Liquid Pipe
Thermistor Error
Detective Actuators:
Heat exchanger liquid outlet thermistor
Forecast of Cause :
1. Connector connection failur, 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 (CN63:1-2) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.
1 2 3 4 5
1 2 3 4
Heat exchanger liquid outlet thermistor (CN63:1-2)
If the voltage does not appear, replace Main PCB
and execute the check operation again.
Indicate or Display:
Outdoor Unit : E. 83. 1
Indoor Unit
Error Code
Detective details:
Heat exchanger liquid pipe thermistor short or open detected
5
CN63
: Operation LED 8 times Flash, Timer LED 3 Times Flash,
Economy LED Continuous Flash.
: 83
DC
,
02-41