Fujitsu AUXB04GALH Service Manual page 178

Trouble shooting 99
INDOOR UNIT Error Method:
Communication Error between
Indoor Unit and Wireless LAN adapter
Detective Actuators:
Wireless LAN adapter PCB
Controller PCB
Forecast of Cause:
1. Connection between A/C and Wireless LAN adapter failure
2. Wireless LAN adapter PCB failure
3. Controller PCB failure
Check Point 1 : Cheak the connection
Check any loose or removed connection of between the Wireless LAN adapter PCB and Controller PCB
>If there is abnormal condition, correct it.
Check the connection condition on the Controller PCB
>If there is loose connector, open cable or miswiring, correct it.
OK
Check Point 2 : Replace wireless LAN adapter
If Check Point 1 do not improve the symptom, replace Wireless LAN adapter and
Please cancel the air conditioner of the registration on the Mobile App.
After the replace adapter, Please perform the pairing on the app.
>> Refer to " Air conditioning unregistration method"
>> Refer to " Air conditioner registration Paring Method"
OK
Check Point 3 : Replace Controller PCB
If Check Point 2 do not improve the symptom, replace controller PCB.
Indicate of Display:
Indoor Unit :
Operation lamp: 1 times Flash,
Timer lamp : 8 times Flash
ERROR CODE : [ 18 ]
Detective details:
After receiving a signal from the wireless LAN adapter,
the same a signal has not been received for 15sec.
04-108
Wireless LAN adapter :
LED 1 (Green) : Flashing Fast
LED 2 (Orange) : ON
NG
Controller PCB