Fujitsu AUXB04GALH Service Manual page 130

Trouble shooting 42
OUTDOOR UNIT Error Method:
Suction Gas Temp Sensor Error
Detective Actuators:
Suction gas temp. sensor
Forecast of Cause :
1. Connector connection defective, open
2. Sensor 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 sensor
Sensor characteristics check (Disconnect the sensor from the PCB and check.)
* For the sensor characteristics, refer to the "Service Parts Information 24".
OK
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Main PCB (CN165:1-3) voltage value = 5V
Remove the sensor from Main PCB, check the voltage.
THERMISTOR (SUC. TEMP.)
BLACK
1 1
2 2
CN165
BLACK
3 3
Suction gas temp. sensor (CN165:1-3)
If the voltage does not appear, replace Main PCB and set up original address.
Indicate or Display:
E75. 1
Outdoor Unit : E. 7 5. 1
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Error Code : 9 U / 7 5
Detective details:
Suction gas temp. sensor short or open detected
04-54
Filter LED Continuous Flash.
DC