Indoor Unit Error Method - Fujitsu ASTG18KMTC Service Instruction

2-4 TROUBLE SHOOTING WITH ERROR CODE

Trouble shooting 29

External Communication Error

(Communication Error of between

Indoor Unit to 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 : 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 : 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.

> Air conditioning de-registration method, refer to page "02 - 44"

>

Pairing

method, refer to page "02 - 45"

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

W-LAN lamp

: On or Off

ERROR CODE : [ 18 ]

Detective details:

After receiving a signal from the wireless LAN adapter,

the same a signal has not been received for 15sec.

Outdoor unit

02-38

(For WIRELESS LAN ADAPTER)

NG

Indoor unit

Controller PCB

Parts：

Wireless

LAN

Wireless LAN

router

adapter

Internet

CLOUD

Mobile App

(Mobile device)