Fujitsu AUXB04GALH Service Manual page 124

Trouble shooting 36
OUTDOOR UNIT Error Method:
Compressor Temp Sensor 1 Error
Detective Actuators:
Compressor temp. sensor 1
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
Thermistor 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 (CN162: 3-4) voltage value = 5V
Remove the sensor from Main PCB, check the voltage.
THERMISTOR (DIS.TEMP.1)
BLACK
1
1
BLACK
2
2
BLACK
3
3
BLACK
4 4
CN162
THERMISTOR (COMP SHELL 1)
5 5
6 6
7 7
8 8
Compressor temp. sensor 1 (CN162: 3-4)
If the voltage does not appear, replace Main PCB and set up original address.
Caution
By changing of DIP SW 4-2 to ON, the Back-up operation can start when the active outdoor unit exists on the multi outdoor unit connection.
(Stand alone outdoor unit is impossible)
The following conditions will be concerned in use of back-up operation. (Please do not use the system with back-up operation for long time.)
- The operating compressor life time becomes shorter.
- The operating performance may drop due to the limited active compressor(s).
- The compressor may stop frequently by protection controlling.
*In order to keep the operating capacity, the release of the Low noise mode setting might be necessary.
Indicate or Display:
E72. 1
Outdoor Unit : E. 7 2. 1
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Error Code : 9 U / 7 2
Detective details:
Compressor temp. sensor 1 short detected
Compressor temp. sensor 1 open detected after compressor 1 operated
continuously for 5 minutes or more
04-48
Filter LED Continuous Flash.
DC