Fujitsu ARCG040LSTA Service Instruction page 38

Trouble shooting 10
INDOOR UNIT Error Method:
Drain pump error
Detective Actuators:
Indoor unit Controller PCB
Float switch
Forecast of Cause : 1. Float switch failure
4. Drain pump 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 abnormal, replace it.
OK
Check Point 2 : Check Connector (CN 9) / Wire
Check loose contact of CN9 /shorted wire (pinched wire).
>>Replace Float switch if the wire is abnormal
OK
Check Point 3 : Check Drain hose
Check Drain hose .
>>If there is Hose clogging. Please clear the clog.
OK
Check Point 4 : Check Controller PCB
If Check Point 1 ~ 3 do not improve the symptom, change
Controller PCB and execute the check operation again.
Indicate or Display:
Outdoor Unit : No indication
Indoor Unit : Operation lamp: 5 time Flash, Timer lamp: 3 time Flash
Economy lamp : Continuous flash.
ERROR CODE : [E : 53]
Detective details:
When Float switch is ON for more than 3 minutes.
2. Shorted connector/wire
5. Hose clogging
02-12
3. Controller PCB failure
ON OFF