Fujitsu AUXB04GALH Service Manual page 141

Trouble shooting 53
OUTDOOR UNIT Error Method:
Compressor Motor Loss of
Synchronization
Detective Actuators:
Inverter PCB
Forecast of Cause :
1. Inverter PCB defective
2. Inverter compressor defective (lock)
Check Point 1 : Check the Inverter PCB
Inverter PCB check (Refer to Service Parts Information 4)
OK
Check Point 2 : Replace the Inverter compressor
Inverter compressor replacement
After fixing the problem and for canceling the Error, Error Reset (F3-40) will be required after power reset
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:
E95. 5
Outdoor Unit : E. 9 5. 5
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Error Code : 9 U / 9 5
Detective details:
"Protection stop by "loss of synchronization detection"" generated
consecutively 5 times
* The number of generations is reset if protection stop is not generated again
within 40 seconds after restarting.
04-65
Filter LED Continuous Flash.