Fujitsu AB 14LBAJ Series Service Instruction page 72

Trouble shooting 23
OUTDOOR UNIT Error Method:
INDOOR UNIT
Connected Indoor unit error
Detective Actuators:
Outdoor Unit Main PCB Circuit
Forecast of Cause :
1. The selection of connected indoor unit is incorrect
Check Point 1 : Check the total capacity of indoor unit
Check the total capacity of the connected indoor units.
>>If abnormal condition is found, correct it by referring
to Installation Manual or Data & Technical Manual.
OK OK
Check Point 2 : Replace Main PCB
If Check Point 1 do not improve the symptom, change Main PCB.
Trouble shooting 24
OUTDOOR UNIT Error Method:
INDOOR UNIT
Main CPU - Sub CPU
communication error
Detective Actuators:
Outdoor Unit Main PCB Circuit
Forecast of Cause :
1. Main PCB failure
Check Point 1 : Replace Main PCB
Change Main PCB.
Indicate or Display:
Refer to error code table.
Detective details:
When the total capacity of the connected indoor units exceed
the connectable range of the total capacity.
2.Main PCB failure
Indicate or Display:
Refer to error code table.
Detective details:
When it cannot receive an effective signal for 10sec between
the Main CPU and Sub CPU in outdoor unit.
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