Fujitsu ARYG72LHTA Service Instruction page 63

Trouble shooting 26
OUTDOOR UNIT Error Method:
Current Sensor Error
Detective Actuators:
Power supply PCB
Transistor PCB
Forecast of Cause :
1. Defective connection of electric components
4. Transistor PCB failure
Check Point 1-1 : Reset Power Supply and operate
Does Error indication show again?
YES
Check Point 2 :
Check connections of Outdoor Unit Electrical Components
Check if
the terminal connection
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
Check Point 3 : Replace Filter PCB
If Check Point 1, 2 do not improve the symptom, change Power supply PCB .
OK
Check Point 4 : Replace Main PCB
If Check Point 3 do not improve the symptom, change Transistor PCB
Indicate or Display:
Error code : 84
Detective details:
When Input Current Sensor has detected 0A, while Inverter Compressor is
operating at higher than 50rps, after 1minute upon starting the Compressor.
(Except during the defrost operation)
is loose.
Outdoor unit :
PUMP
POWER
DOWN
ERROR
MODE
2
2 . External cause 3. Power supply PCB failure
NO
Check Point 1-2 :
Check external cause at Indoor and Outdoor
(Voltage drop or Noise)
Instant drop : Check if there is a large load electric
Momentary power failure : Check if there is a defective
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.
02-27
LOW PEAK
NOISE CUT
(L1) (L2) (L3) (L4) (L5) (L6)
8 4
apparatus in the same circuit.
contact or leak current in the
power supply circuit.