Fujitsu ASU18RLF Service Instructions Manual page 63

Trouble shooting 18
OUTDOOR UNIT Error Method:
Active Filter Error
Detective Actuators:
Outdoor unit main PCB
Active filter module
Forecast of Cause:
1. External cause
Test 1 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)
Instant drop : Check if there is a large load electric apparatus in the same circuit.
Momentary power failure : Check if there is a defective contact or leak current
in the power supply circuit.
Noise : Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.
OK
Test 2 : Check connection of Connector
Check if connector is removed.
Check erroneous connection.
Check if cable is open.
>>Upon correcting the removed connector or miss-swiring, reset the power.
OK
Test 3 : Check Active filter module
Check Active filter module. (SERVICE PARTS INFORMATION 8)
>>If Active filter module is abnormal, replace it.
OK
Test 4 : Replace Main PCB
If Test 1 - 3 do not improve the symptom, replace Main PCB.
(SERVICE PARTS INFORMATION 10)
Indicate of Display:
Indoor Unit
Operation lamp : 6 time Flash
Timer lamp
ERROR CODE : [E : 64]
Detective details:
When inverter input DC voltage is higher than 430V or lower than 110V.
When a momentary power cut off occurred on low voltage.
2. Connector connection failure
02-23
Outdoor Unit
No Display
: 4 time Flash
3. Main PCB failure 4. Active filter module failure