Fujitsu AB*14LBAJ Service Instruction page 54

Trouble shooting 6
INDOOR UNIT Error Method:
Water Drain Abnormal
Detective Actuators:
Indoor Unit Controller PCB Circuit
Float Switch
Forecast of Cause :
1. Float Switch failure 2. Shorted connector/ wire 3. Controller PCB failure
Check Point 1 : Check Float Switch
Check operation of float switch. (any blocking by dust, etc.)
Remove Float switch and check ON/OFF switching operation
by using a meter.
>>If Float switch is detective, replace it.
OK OK
Check Point 2 : Check Point 2 : Check Connector (CN15) / Wire
Check loose contact of CN15 /shorted wire (pinched wire).
>>Replace Float switch if the wire is abnormal
OK OK
Check Point 3 : Replace Controller PCB
If Check Point 1 & 2 do not improve the symptom, change Controller PCB.
Indicate or Display:
Refer to error code table.
Detective details:
When Float Switch is ON for more than 3 minutes.
02-16
ON ON OFF OFF