Fujitsu ASU18RLB Service Instructions Manual page 29

Trouble shooting 2
INDOOR UNIT Error Method:
Wired Remote Controller
Communication Error
Detective Actuators:
Indoor unit Controller PCB
Wired remote control
Forecast of Cause:
1. Terminal connection abnormal
Check Point 1 : Check the connection of terminal
After turning off the power, check & correct the followings.
Check the connection of terminal between remote control and Indoor unit,
and check if there is a disconnection of the cable.
OK OK
Check Point 2 : Check Remote Control and Controller PCB
Check Voltage at CN6 (terminal 1-3) of Controller PCB .
(Power supply to Remote Control)
>> If it is DC12V, Remote Control is failure. (Controller PCB is normal)
>> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again) >> Replace Controller PCB
Upon correcting the removed connector or miss-wiring, reset the power.
Indicate or Display:
Outdoor Unit : No indication
Indoor Unit : Operation lamp: 1 time Flash, Timer lamp: 2 time Flash
Economy lamp: Continuous flash.
ERROR CODE : [E : 12]
Detective details:
When the indoor unit cannot receive the signal from Wired Remote Control
more than 1minute during normal operation.
2. Wired remote control failure
02-05
3. Controller PCB failure
>> Replace Remote Control