Fujitsu AO G24KATA Series Service Instruction page 45

Trouble shooting 16
INDOOR UNIT Error Method:
Drain Pump Error
Detective Actuators:
Indoor unit Controller PCB Circuit
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 and 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 : Replace Drain pump
If Check Point 1- 3 do not improve the symptom,
replace Drain pump.
OK
Check Point 5 : Replace Controller PCB
If Check Point 4 do not improve the symptom,
replace Controller PCB.
Indicate or Display:
Error code : 53
Detective details:
When Float switch is ON for more than 3 minutes.
2. Shorted connector/wire
5. Hose clogging
02-17
Outdoor unit : No indication
3. Controller PCB failure
ON OFF