Fujitsu ARYG72LHTA Service Instruction page 50

Trouble shooting 12
INDOOR UNIT Error Method:
Indoor unit Communication circuit
(wired remote controller) error
Detective Actuators:
Indoor unit Controller PCB circuit
Forecast of Cause :
1.Communication PCB defective
2. Indoor unit controller PCB defective
Check Point 1 : Check the connection of terminal
After turning off the power supply, check & correct the followings
Indoor unit - Check the connection the communication PCB and the controller PCB
OK
Check Point 2 : Replace the communication PCB
If the Check point 1 is ok, replace the communication PCB
OK
Check Point 3 : Replace the controller PCB
If condition is doesn't change, replace the controller PCB
Indicate or Display:
Error code : 3A
Detective details:
Detect the communication error of microcomputer and communication PCB.
02-14
Outdoor unit :
PUMP LOW
POWER
DOWN NOISE
ERROR
MODE (L1) (L2) (L3) (L4)
5 15
2
PEAK
CUT
(L5) (L6)