Fujitsu AGU12RLF Service Instruction page 38

Trouble shooting 9
OUTDOOR UNIT Error Method:
Outdoor unit main PCB error
Detective Actuators:
Outdoor unit Main PCB
Forecast of Cause:
1. External cause (Noise, temporary open, voltage drop)
Check Point 1-1 : Reset Power Supply and operate
Does Error indication show again?
YES YES
Check Point 2 : Replace Main PCB
Change Main PCB.
Indicate or Display:
Refer to error code table.
Detective details:
Access to EEPROM failed due to some cause after outdoor unit started.
NO
Check Point 1-2 : Check external cause
Check if temporary voltage drop was not generated.
Check if momentary open was not generated.
Check if ground is connection correctly or there are no related
cables near the power line.
02-13
2. Main PCB failure