Fujitsu AUXB04GALH Service Manual page 202

SERVICE INFORMATION
Network communication Abnormal
- Basic trouble shooting procedure -
1. Check Error code in one network segment separately, and check the Error code of (Outdoor unit, Indoor unit, Remotecontroller
Service tool)
< If the system has more than 2 Net work segments, disconnect the other Network segment.>
2. Connect Service tool to the Outdoor unit, and try out "Address checker" Function by the Service tool.
< Check missing indoor unit or outdoor unit by using Address checker function of Service tool>
3. Check terminal resistance value 53 Ohm + 5% + Line Resistance on the terminal board one by one.
< Terminal Resistance is located on the Outdoor unit PCB(activated SET 5-4 ON) >
*Refer to the wiring diagram of Networlk cable
Example
Terminal Resistance A is located on the controller PCB of Outdoor unit as the Network for Indoor
Outdoor unit
< Main PCB >
-SET 5-4:ON-
Terminal -
Resistance
A
53 Ohm
Transmission
Transmission
Indoor unit 1
Measurement
Terminal Resistance A
-
Refrigerant piping
Transmission
Indoor unit 2
Measurement
Terminal Resistance A
To other refrigerant circuit
Outdoor unit
Transmission
Indoor unit 3
Measurement
Terminal Resistance A
04-132
unit.
Transmission
Transmission
Indoor Unit
Indoor unit 4
Measurement
Terminal Resistance A