Fujitsu ASU18RLF Service Instructions Manual page 58

Trouble shooting 13
INDOOR UNIT Error Method:
Intake Grille Error
Detective Actuators:
Indoor unit controller PCB
Micro switch
Forecast of Cause:
1. Micro switch failure
Test 1 : Check Limit switch
Check operation of Micro switch. (any blocking by dust, etc.)
Remove Micro switch and check ON/OFF switching operation by using a meter.
>>If Micro switch is detective, replace it.
OK
Test 2 : Check Connector (CN11) / Wire
Check loose contact of CN11 /shorted wire (pinched wire).
>>Replace Micro 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 : 8 time Flash
ERROR CODE : [E : 58]
Detective details:
When the Micro switch detected open while running the compressor.
2. Shorted connector/ wire
02-18
Outdoor Unit
A B
: Light ON : Light OFF
3.Controller PCB failure
Monitor
C D E F
n : n time blinking