Fujitsu AB*14LBAJ Service Instruction page 64

Trouble shooting 16
OUTDOOR UNIT Error Method:
INDOOR UNIT
Active Filter Module (AFM) error
Detective Actuators:
Outdoor Unit Main PCB Circuit
Active Filter Module
Forecast of Cause :
1. External cause 2. Connector connection failure 3. Active Filter Module failure•@‚S. Main PCB failure
Check Point 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
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 OK
Check Point 2 : Check connection of Connector
Check if connector is removed.
Check erroneous connection.
Check if cable is open.
>>Upon correcting the removed connector or mis-wiring, reset the power.
OK OK
Check Point 3 : Check Active Filter Module
Check Active Filter Module. (PARTS INFORMATION 3)
>>If Active Filter Module is abnormal, replace it.
OK OK
Check Point 4 : Replace Main PCB
If Check Point 1, 2 do not improve the symptom, change Main PCB.
Indicate or Display:
Refer to error code table.
Detective details:
When inverter input DC voltage is higher than 467V or
lower than 237V.
When a momentary power cut off occurred on low voltage.
in the power supply circuit.
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