Fujitsu Comfort Series Service Manual page 36

Troubleshooting 15
OUTDOOR UNIT Error Method:
Current sensor error
Detective Actuators:
Outdoor unit Inverter 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 is loose.
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 Inverter PCB
If Check Point 1, 2 do not improve the symptom,
change Inverter PCB.
Indicate or Display:
Hydraulic unit :
Green Red
8 4
n : n times blinking
Detective details:
When Input Current Sensor has detected 1A or less,
while Inverter Compressor is operating at higher than 50rps,
after 1minute upon starting the Compressor.
(Except during the defrost operation)
2. External cause
NO
Check Point 1-2 :
03-17
Outdoor unit :
Mode Error L1 L2
2 8
: Light OFF : Light ON
3. Inverter PCB failure
Check external cause at hydraulic and outdoor
unit (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.
L3 L4 L5 L6
4
n : n times blinking