Fujitsu AUXB04GALH Service Manual page 82

Trouble shooting 4
OUTDOOR UNIT Error Method : :
Outdoor Unit Network
Communication 2 Error
Detective Actuators:
Outdoor unit Main PCB
Forecast of Cause : 1. Noise, momentary open, voltage drop
3. Communication line connection defective
5. Communication PCB mounting defective, Communication PCB defective
6. Control PCB defective
Check Point 1 : Noise, momentary open, voltage drop
Check if temporary voltage drop was not generated.
Check if momentary open was not generated.
Check if ground is connection correctly or there are no related cables near the power line.
OK
Check Point 2 : Check the indoor unit power supply
Main power ON check
Power cable connection and open check
OK
Check Point 3 : Check the communication line connection
Communication line connection, open check
Refer to SERVICE INFORMATION Network communication Abnormal
OK
Check Point 4 : Check the Terminal resistor setting
Terminal resistor setting check
OK
Check Point 5 : Check the communication PCB (outdoor unit/ indoor unit)
Communication PCB connection check
Communication PCB check
OK
Check Point 6 : Replace Main PCB (outdoor unit/ indoor unit)
Change Main PCB and set up the original address.
Indicate or Display:
E14. 2
Outdoor Unit : E. 1 4. 2
Indoor Unit : Operation LED 9 times Flash, Timer LED 15 Times Flash,
Error Code : 9 U / 1 4 / 1 6 / 1 4. 2
* Indoor unit indicates 9 U or 1 4
Peripheral device indicates 1 4 or 1 6
Detective details:
No communication for 180 seconds or more from an indoor unit which
received communication once.
No communication for 180 seconds or more from all indoor units that once
received communication.
04-12
Filter LED Continuous Flash. /
Operation LED 1 times Flash, Timer LED 4 Times Flash,
Filter LED Continuous Flash. *
2. Indoor unit power off
4. Terminal resistor setting mistake