Fujitsu ARYG72LHTA Service Instruction page 54

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 2. Shorted connector/wire 3. Controller PCB failure
4. Drain pump failure 5. Hose clogging
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 and 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:
Error code : 53
Detective details:
When Float switch is ON for more than 3 minutes.
02-18
Outdoor unit :
PUMP LOW
POWER
DOWN NOISE
ERROR
MODE (L1) (L2) (L3) (L4)
15
2 5
ON OFF
PEAK
CUT
(L5) (L6)