Fujitsu AU G12LVLB Series Service Instruction page 80

Trouble shooting 37
INDOOR UNIT Error Method:
Wireless LAN adapter Non-Energized
Detective Actuators:
Indoor unit Controller PCB
Wireless LAN adapter PCB
Forecast of Cause:
1. Indoor unit Controller PCB
2. Wireless LAN adapter PCB failure
3. Wiring connection failure
Check Point 1 : 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 2 : Check the
Check Voltage at CN12 (terminal 1-2) of Controller PCB.
>If it is DC 0V, Controller PCB is failure.
Replace Controller PCB.
>If it is DC12V, Wireless LAN adapter PCB failure.
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 - 48"
>>Pairing method, refer to page "02 - 49"
Indicate of Display:
Indoor Unit :
Operation lamp: 1 time Flash
Timer lamp
ERROR CODE : [ 18 ]
Detective details:
When the does not output the DC12 voltage from Controller PCB.
failure
Wireless LAN adapter PCB and Controller PCB
: 8 time Flash
02-47
Wireless LAN adapter :
LED 1 (Green) : OFF
LED 2 (Orange) : OFF