Fujitsu AUXB04GALH Service Manual page 106

Trouble shooting 28
INDOOR UNIT Error Method:
Indoor unit Drain pump Error
Detective Actuators:
Indoor Unit Controller PCB Circuit
Float Switch
Forecast of Cause :
1. Drain Installation
4. Shorted connector/wire 5. Controller PCB defective / Drain pump defective
Check Point 1 : Check Drain pipe installation
Check Drain pipe installation (Refer to the installaion manual)
The Height limit for Drain pump, The angle of drain pipe, The angle of indoor unit
OK
Check Point 2 : Check Drain pipe blockage
Check Drain pipe line blockage
The drain pump inlet and outlet, The connecting pipe, The drain pipe outlet
OK
Check Point 3, 4 : Check Float Switch operation, connecting wire shorted.
Check operation of float switch.
Remove Float switch and check ON/OFF switching operationby using a meter.
>>If Float switch is defective, replace it.
ON
OK
Check Point 5 : Check controller PCB defective / Drain pump defective
Measure power supply (AC198 - 264V) for the drain pump on
the Power supply PCB (CN106) at the Float SW ON states.
>>If No voltage on the connector, replace the power supply PCB
>>If AC198- 264V on the connector, replace the Drain pump
Indicate or Display:
E53. 1
Outdoor Unit : E.5 U.1
Indoor Unit : Operation LED 5 times Flash, Timer LED 3 Times Flash,
Error Code : 5 3
Detective details:
When Float switch is ON for more than 3 minutes.
2. Drain pipe line blockage
OFF
04-36
Filter LED Continuous Flash.
3. Float switch defective