Fujitsu AR G30LHTBP Series Service Instructions Manual page 55

Trouble shooting 15
INDOOR UNIT Error Method:
Drain pump Error
Detective Actuators:
Indoor Unit Controller PCB Circuit
Float Switch
Forecast of C ause : 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 and Drain Pump
Check Drain Pump.
If drain pump is not run on the working condition, check the voltage of the CN71 on the controller PCB.
DC12V
CN71-1
CN71 CN71-2
CN71-3
CN71-4
B
Measurement result
12V : Replace the Drain Pump
Other than 12V : Replace the controller PCB
Indicate or Display:
Error code : 53
Detective details:
When Float switch is ON for more than 3 minutes.
DC DRAIN PUMP MOTOR
RED
M
WHITE
Outdoor unit : Model 45.54
POWER
DOWN
ERROR
MODE
2
ON
02-18
PUMP LOW PEAK
NOISE CUT
(L1) (L2) (L3) (L4) (L5) (L6)
5 15
OFF