Fujitsu AUXB04GALH Service Manual page 135

Trouble shooting 47
OUTDOOR UNIT Error Method:
Current Sensor 1 abnormal
Detective Actuators:
Judgment from value sensed by current
sensor 1 (current sensor for inverter)
* Current sensor 1 is mounted on
Filter PCB(INV)
Forecast of Cause :
1. Power supply defective
2. Power cable disconnection , open
3. Filter PCB (INV) to Inverter PCB CT system wiring connector disconnection, open
4. Power supply to Filter PCB (INV) to Inverter PCB wiring disconnection, open
5. Filter PCB(INV) defective (Power supply section, current sensor section)
6. Inverter PCB defective
Check Point 1 : Check the power supply
Main power ON/OFF state check
Power cable connection, open check
OK
Check Point 2 : Filter PCB(INV) to Inverter PCB CT system wiring connection state
Connector and wiring connection state check
Cable open check
OK
Check Point 3 : Check the wiring (Power supply to Filter PCB (INV) to Inverter PCB)
Connector connection state check
Cable open check
OK
Check Point 4 : Check Filter PCB (INV) and Inverter PCB
Chack Filter PCB (INV) and Inverter PCB.
(Refer to "Service Parts Information 4")
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:
E84. 1
Outdoor Unit : E. 8 4. 1
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Error Code : 9 U / 8 4
Detective details:
"Protection stop by "inverter speed
for 1 min"" was generated 2 times
Sensor value while inverter stopped = maximum was detected
04-59
Filter LED Continuous Flash.
20rps and sensor value 0A continued