Fujitsu Airstage V-II Service Manual page 77

Trouble shooting 7
INDOOR UNIT Error Method:
Water Drain Abnormal
Detective Actuators:
Indoor Unit Controller PCB Circuit
Float Switch
Forecast of Cause : 1. Float switch defective 2. Shorted connector/wire 3. Controller PCB defective 4. Drain pump defective
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 defective, replace it.
OK
Check Point 2 : Check Connector (CN 1) / Wire
Check loose contact of CN1 /shorted wire (pinched wire).
>>Replace Float switch if the wire is abnormal
OK
Check Point 3 : Check Controller PCB
If Check Point 1 & 2 do not improve the symptom, change
Controller PCB and set up the original address.
(Refer to 06-03 page Main PCB removal.)
Indicate or Display:
Outdoor Unit : E.5 U.1
Indoor Unit : Operation LED 5 times Flash, Timer LED 3 Times Flash,
Filter LED Continuous Flash.
Error Code : 5 3
Detective details:
When Float switch is ON for more than 3 minutes.
04-16
ON
Attention!!
Small size wall mount type does not have a
float switch. In this case, replace
and set up the original address. Please refer to.
OFF
PCB
Controller