Fujitsu AUXB04GALH Service Manual page 172

Trouble shooting 94
Error Contents :
Network communication Error
Details :
Condition of occurrence :
When the signal is cut off for more than 10 minutes from the registered Indoor unit (not including Slave unit).
Release condition : 1. The signal has been received from the Indoor units that was creating the error.
2. MPU has been booted up. (Release from the reset operation, the power failure stand-by operation.
Cause 1 : Connection failure
Check transmission cable
Check disconnected power line for Indoor unit.
Check if convertor power line is disconnected.
OK
Cause 2 : Check outside cause (Voltage drop or noise, etc.)
Instant drop ----- Check if there is a large load electric apparatus in the same circuit.
Momentary power failure ----- Check if there is a defective contact or leak current in the power supply circuit.
Noise ----- Check if there is any equipment causing harmonic wave near electric line (Neon bulb or electric equipment that may cause
OK
Cause 3 : Remote Controller is defective.
Replace Group Remote Controller.
Group Remote Controller (UTY-CGGY / CGGG)
Symptom :
Error Code display [ 1 4 ]
OPERATION LED is flashing.
harmonic wave).
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