Fujitsu AU G12LVLB Series Service Instruction page 47

For AR*G**LSLAP
Trouble shooting 4
INDOOR UNIT Error Method:
External Communication Error
Detective Actuators:
External communication error
Forecast of Cause:
1. Connection failure
Check Point 1 : Check the connection
Check any loose or removed connection of between the controller PCB
>>If there is an abnormal condition, correct it by refer to installation manual or
the technical manual.
Check the condition condtion on the controller PCB
(If there is loose connector, open cable or miss-wiring)
OK OK
Check Point 2: Replace external I/O PCB
If Check Point 1 do not improve the symptom.
OK OK
Check Point 3: Replace Controller PCB
If Check Point 2 do not improve the symptom, change Controller PCB.
Indicate or Display:
Outdoor Unit : No indication
Indoor Unit
ERROR CODE : [E : 18]
Detective details:
After receiving a signal from the same a signal
has not been received for 15sec
2.Controller PCB failure
02-14
: Operation lamp: 1 time Flash, Timer lamp: 8 time Flash
Economy lamp : Continuous flash.