Fujitsu AU G18LVLB Series Service Instruction page 32

Trouble shooting 3
INDOOR UNIT Error Method:
Wired Remote Controller
Communication Error
Detective Actuators:
Indoor unit Controller PCB
Wired Remote Controller
Forecast of Cause:
1. Connection failure
Check Point 1 : Check the connection of terminal
After turning off the power,
Check & correct the followings.
Check the connection of terminal berween Wired Remote Controller and indoor unit,
and check if there is a disconnection of the cable.
OK
Check Point 1-2 : Check Wired Remote Controller and Controller PCB
Ceck Voltage at CN14 of Controller PCB. (Terminal 1-3, Terminal 1-2)
(Power supply for the Remote Control)
>> If it is DC13V, Remote Control is failure. (Controller PCB is normal)
>> If it is DC 0V, Controller PCB is failure.
Check Point 2 : Wire installation Wrong RCgroup setting
Wrong wire connection in RCgroup (Please refer to the installation manual)
The number of connecting indoor unit and Remote controller in one RCgroup were less than 32 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 controller address
Indicate or Display:
Error code : 12
Detective details:
When the indoor unit cannot properly receive the signal from
Wired Remote Controller for 1 minute or more.
2. Wired Remote Controller failure
(Check Remote Control once again) >> Replace Controller PCB
Outdoor unit : No indication
3. Controller PCB failure
02-04
>> Replace Remote Control