Fujitsu ASU18RLF Service Instructions Manual page 71

Trouble shooting 26
OUTDOOR UNIT Error Method:
CT Error
Detective Actuators:
Outdoor unit main PCB
Forecast of Cause:
1. Defective connection of electric components
Test 1-1 : Reset Power Supply and operate
Does Error indication show again?
YES
Test 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
Test 4 : Replace Main PCB
If Test 1, 2 do not improve the symptom, replace Main PCB.
(SERVICE PARTS INFORMATION 10)
Indicate of Display:
Indoor Unit
Operation lamp : 8 time Flash
Timer lamp
ERROR CODE : [E : 84]
Detective details:
When Input Current Sensor has detected 0A, while Inverter Compressor is
operating at higher than 60 rps, after 1 minutes upon starting the Compressor.
( Except during the defrost operation )
is loose.
02-31
Outdoor Unit
A
: 4 time Flash
8
: Light ON
2. External cause 3. Main PCB failure
NO
Test 1-2 : 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
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.
Monitor
B C D E F
4
: Light OFF n : n time blinking
contact or leak current in the
power supply circuit.