Fujitsu AUXB04GALH Service Manual page 121

Trouble shooting 33
OUTDOOR UNIT Error Method:
Rush Current Limiting Resistor
Temp Rise Protection
Detective Actuators:
Inverter PCB
Forecast of Cause :
1. Magnetic relay (for INV) coil side wiring disconnection, open
2. Power supply to Filter PCB (INV) to Inverter PCB wiring disconnection, open
3. Magnetic relay activation circuit defective
4. Main PCB to Inverter PCB wiring disconnection, open
5. Main PCB output AC198 - 242V on CN130 defective
Main PCB defective (output
Check Point 1 : Check the magnetic relay (for invertert) coil side wiring
Connector and wiring connection state check
Cable open check
OK
Check Point 2 : Check Power supply to Filter PCB (INV) to inverter PCB wiring
Connector and wiring connection state check
Cable open check
OK
Check Point 3-1 : Magnetic relay activation circuit
Chack the DC Voltage (12V) of CN330 on INVERTER PCB
OK
Check Point 4 : Check the wiring (Main PCB to Inverter PCB)
Check the wiring connection.
(CN138 on Main PCB to CN330 on Inverter PCB)
OK
Check Point 5 : Main PCB output AC198 - 242V for Magnetic relay
Check the AC198 - 242V of CN130 on Main PCB
OK
Check Point 6 : Replace Main PCB
Change Main PCB and set up the original address.
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:
E68. 2
Outdoor Unit : E. 6 8. 2
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Error Code : 9 U / 6 8
Detective details:
"Protection stop by "Rush current limiting resistor temperature rise detection''
of inverter PCB" was generated 2 times.
AC198 - 242V
04-45
Filter LED Continuous Flash.
on CN130 for Magnetic relay (INV) defective)
NG
Replace Inverter PCB