Fujitsu ASU18RLF Service Instructions Manual page 57

Trouble shooting 12-2
INDOOR UNIT Error Method:
Damper Error
(Damper (open/colse) simultaneous detection
limit switch error)
Detective Actuators:
Indoor unit controller PCB
Limit switch
Forecast of Cause:
1. Limit switch failure
Test 1 : Check Limit switch
Check operation of limit switch. (any blocking by dust, etc.)
Remove Limit switch and check ON/OFF switching operation by using a meter.
>>If Limit switch is detective, replace it.
OK
Test 2 : Check Connector (CN18) / Wire
Check loose contact of CN18 /shorted wire (pinched wire).
>>Replace Limit switch if the wire is abnormal
OK
Test 3 : Replace Controller PCB
If Test 1 - 2 do not improve the symptom, change Controller PCB.
Indicate of Display:
Indoor Unit
Operation lamp : 5 time Flash
Timer lamp : 7 time Flash
ERROR CODE : [E : 57]
Detective details:
When the limit switch detects open and close at the simultaneous.
2. Shorted connector/ wire
02-17
Outdoor Unit
Monitor
A B C
: Light ON : Light OFF
3. Controller PCB failure
D E F
n : n time blinking