Fujitsu ASU18RLF Service Instructions Manual page 47

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
Test 1 : Check the connection of terminal
Check & correct the followings.
Check the connection of terminal between Wired Remote Controller and indoor unit,
and check if there is a disconnection of the cable.
OK OK
Test 2 : Check Wired Remote Controller and Controller PCB
Check Voltage at terminal 1-3 of Controller PCB or Communication PCB.
(Power supply to Remote Control)
Compact Cassette, Slim Duct Type : CN14
Wall Mount , Floor Type : CN16
Compact Wall Mount Type : CNC01 (UTY-XCBXZ2)
>> If it is DC12V, Remote Control is failure. (Controller PCB is normal)
>> If it is DC 0V, Controller PCB is failure.
Indicate of Display:
Indoor Unit
Operation lamp : 1 time Flash
Timer lamp
ERROR CODE : [E : 12]
Detective details:
When the indoor unit cannot properly receive the signal from
Wired Remote Controller for 1 minutes or more.
2. Wired Remote Controller failure
(Check Remote Control once again) >> Replace Controller PCB
02-07
Outdoor Unit
A
: 2 time Flash
: Light ON
3. Controller PCB failure
>> Replace Remote Control
Monitor
B C D E F
: Light OFF n : n time blinking