Fujitsu AUXB04GALH Service Manual page 84

Trouble shooting 6
OUTDOOR UNIT Error Method:
The number of Indoor unit shortage
Error
Detective Actuators:
Outdoor unit Main PCB
Forecast of Cause :
1. Indoor unit power off
3. Communication line connection defective
5. Communication PCB mounting defective, Communication PCB defective
6. Controller PCB defective
Check Point 1 : Find the indoor unit that the communication is lost.
Check system drawing and service tool.
OK
Check Point 2 : Check the indoor unit power supply
Main power ON check
Power cable connection and open check
OK
Check Point 2 : 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 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
(indoor unit/ outdoor unit)
Communication PCB connection check
Communication PCB check
OK
Check Point 6 : Replace Main PCB and Communication PCB
(indoor unit/ outdoor unit)
Change Main PCB and Communication PCB, and set up the original address.
Indicate or Display:
E14. 5
Outdoor Unit : E.1 4. 5
Indoor Unit
Error Code
*Peripheral device indicates 14,16
Detective details:
When the indoor unit number decreases for 180 seconds from the memorized
maximum indoor units number after power(Breaker) ON.
04-14
: Operation LED 9 times Flash, Timer LED 15 Times Flash,
Filter LED Continuous Flash. /
: 9 U / 1 4 / 1 6 / 1 4. 5 / 1 4. 3 *
2. Noise, momentary open, voltage drop
4. Terminal resistor setting mistake
Attention!!
If the failure indoor unit is pinpointed and it
needs to erase the error indication, it can be
reset by function setting (F3-41: Maximum
memorized indoor unit number reset).
Caution!!
Even if normal, this error occurs temporarily by
the timing of the power ON of outdoor unit,
indoor unit, and signal amplifier.
In this case, please wait for 5 minutes after
turning on all the equipments.