Fujitsu AUXB04GALH Service Manual page 120

Trouble shooting 42
OUTDOOR UNIT Error Method:
Compressor Temp Sensor Error
<TH10>
Detective Actuators:
Compressor temperature thermistor 1
Forecast of Cause :
1. Connector connection defective, open
2. Thermistor defective
3. Main PCB defective
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 17".
OK
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Main PCB (CN146:3-4) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.
Compressor temperature sensor 1 (CN146:3-4)
If the voltage does not appear, replace Main PCB and set up orignal address.
Indicate or Display:
E. 72.1
Outdoor Unit : E. 72. 1
Error Code
Detective details:
Compressor temperature thermistor 1 short detected
Compressor thermistor 1 open detected after compressor 1 operated
continuously for 5 minutes or more
1 2 3 4
1 2 3 4
CN146
Filter LED Continuous Flash.
: 72
DC
04-50