Fujitsu AUXB12GA* H - SERVICE INFORMATION Network Communication Abnormal

Outdoor unit1
(Master unit)
Refrigerant piping
Transmission
Outdoor unit 2
(Slave unit 1)
Outdoor unit 3
(Slave unit 1)
Transmission
Transmission Transmission
Transmission
Transmission
Terminal -
Resistance
53 Ohm
< Main PCB >
-SET 5-4:ON-
TransmissionTransmission
- Basic trouble shooting procedure -
1. Check Error code in one network segment separately, and check the Error code of (OU, IU, RC, ST)
< 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
To other refrigerant circuit
Outdoor unit
A
Measurement
Terminal Resistance A
Measurement
Terminal Resistance A
Measurement
Terminal Resistance A
Measurement
Terminal Resistance A
4-3 SERVICE INFORMATION
SERVICE INFORMATION
Network communication Abnormal
Indoor Unit
Indoor unit 4
Indoor unit 3
Indoor unit 2
Indoor unit 1
Terminal Resistance A is located on the controller PCB of Outdoor unit as the Network for Indoor unit.
-
Example
04-100