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2-4. E: 18. External communication error (Indoor unit)

Indicator Indoor unit

Operation indicator 1 time flash

Timer indicator 8 time flash

Economy indicator Continuous flash

Error code E: 18

Detective actuator Indoor unit

External

communication

error

After receiving a signal from the external input and

output PCB, the same signal has not been received for

15 seconds.

Forecast of cause

Connection failure

WLAN adapter failure

Main PCB

Check point 1. Check the connection

• Check any loose or removed connection between the main PCB to the WAN adapter.

-> If there is an abnormal condition, correct it by refer to the installation manual or the “DESIGN

& TECHNICAL MANUAL”.

• Check the connection condition on the WLAN adapter and the main PCB (If there is loose con-

nector, open cable or mis-wiring.)

↓

Check point 2. Replace the WLAN adapter

If check point 1 do not improve the symptom, change WLAN adapter.

↓

Check point 3. Replace main PCB

If check point 2 do not improve the symptom, change main PCB

↓

End

2-4. E: 18. External communication error (Indoor unit) - (03-15) - 2. Troubleshooting with error code

TROUBLESHOOTING

Fujitsu AOUG15LZAS1 User Manual

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