Fujitsu AOTG30KMTC, Service Manual, Page: 101 / 199

4. Troubleshooting with error code (For wireless LAN adapter)
4-1. E: 18. External communication error between indoor unit
and WLAN adapter
Indicator
Indoor unit
Operation indicator 1 time flash
Timer indicator 8 time flash
Economy indicator Continuous flash
Error code E: 18
Wireless LAN
adapter
LED1 (green) Flashing fast
LED2 (orange) On
Detective actuator
Wireless LAN adapter PCB After receiving a signal from the wireless LAN adapter,
the same signal has not been received for 15 seconds.
NG
Controller
PCB
Controller PCB
Forecast of cause
Connection between indoor unit and wireless LAN
adapter failure
Wireless LAN adapter PCB failure
Controller PCB failure
Check point 1. Check the connection
• Check any loose or removed connection of between the wireless LAN adapter PCB and con-
troller PCB.
-> If there is abnormal condition, correct it.
• Check the connection condition on the controller PCB.
-> If there is loose connector, open cable or mis-wiring, correct it.
↓
Check point 2. Replace wireless LAN adapter.
If check point 1 do not improve the symptom, replace the wireless LAN adapter and cancel the reg-
istration of air conditioner on the mobile app.
After replacing the adapter, perform the pairing on the mobile app.
For the method of the mobile app, refer to "Mobile app setting method" on page 03-70.
↓
Check point 3. Replace controller PCB
If check point 1 to 2 do not improve the symptom, replace the controller PCB.
↓
End
4-1. E: 18. External communication error between indoor unit and WLAN adapter
- (03-63) -
4. Troubleshooting with error code (For wireless LAN adapter)
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