Fujitsu AMUG24LMAS Service Manual page 56

Troubleshooting 3
Wired remote control communication error
Detective details:
Upon receiving signal more than 1 time
from wired remote or other Indoor unit,
but the same signal has not been
received more than 1 minute.
Forecast of cause:
1. Terminal connection abnormal
2. Wired remote control failure
3. Controller PCB failure
Check Point 1 : Check connection of terminal
After turning off the power, check & correct the followings.
Indoor unit - Check the connection of terminal between
remote control and Indoor unit, or between Indoor units, and
check if there is a disconnection or short of the cable.
OK
Check Point 1-2 : Check wired remote control and controller PCB
Check terminal voltage of controller PCB Connector CN300. (Power supply for remote controller)
If DC12V, Remote control failure (Controller PCB is OK) >>> Replace Remote
If DC0V, Controller PCB failure (Remote is OK) >>> Replace Controller PCB
In case of re-installation is done due to removed
connector or incorrect wiring, turn on the power again.
Check Point 2 : Wire installation Wrong RC-group setting
Wrong wire connection in RC-group (Please refer to the installation manual)
The number of connecting indoor unit and Remote control in one RC-group were less than 16 units.
Check Point 2-1 : Check indoor unit controller PCB
Check if controller PCB damage
Change controller PCB and check the Error after setting remote control address
Indicate or Display:
Indoor unit
Operation lamp: 1 times Flash,
Timer lamp
Wired remote
Error code : [E : 12]
Outdoor unit (AOUG36/48LMAS1)
Mode Error
2
: Light OFF
03-08
: 2 times Flash
A B C D E
15
5
n : n times blinking
: Light ON
DC
F