Fujitsu ASU18RLB Service Instructions Manual page 42

Trouble shooting 15
OUTDOOR UNIT Error Method:
Current Sensor Error
Detective Actuators:
Outdoor unit Main PCB
Forecast of Cause :
1. Defective connection of electric components
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 miss-wiring,
reset the power.
OK
Check Point 3 : Replace Main PCB
If Check Point 1, 2 do not improve the symptom, change Main PCB.
Indicate or Display:
Outdoor Unit : No indication
Indoor Unit
ERROR CODE : [E : 84]
Detective details:
When Input Current Sensor has detected 0A, while Inverter Compressor is
operating at higher than 56rps, after 1minute upon starting the Compressor.
(Except during the defrost operation)
is loose.
: Operation lamp: 8 time Flash, Timer lamp: 4 time Flash
Economy lamp: Continuous flash.
2. External cause 3. Main 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.
02-18
apparatus in the same circuit.
contact or leak current in the
power supply circuit.