Fujitsu ARYG72LHTA Service Instruction page 41

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
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 2 : Check Wired Remote Controller and Controller PCB
Ceck Voltage at CN14 of Controller PCB. (terminal 1-3)
(Power supply to Remote Control)
>> If it is DC13V, Remote Control is failure. (Controller PCB is normal)
>> If it is DC 0V, Controller PCB is failure.
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 :
POWER
ERROR
MODE
2
3. Controller PCB failure
02-05
PUMP LOW PEAK
DOWN NOISE CUT
(L1) (L2) (L3) (L4) (L5)
5 15
>> Replace Remote Control
(L6)