Fujitsu AS*G09KXCA Series Service Instruction page 67

CONTINUATION
YES
Check Point 3-2 : Check 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 4 : Replace Wireless LAN adapter
If Check Point 2,3 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.
>>Air conditioning de-registration method, refer to page "02 -
>>Pairing method, refer to page "02 - 37"
OK
Check Point 5 : Replace Controller PCB
If Check Point 4 do not improve the symptom, replace controller PCB.
36 "
02-34