Trouble Shooting With No Error Code - Fujitsu ASU18RMLQ Service Instruction

2-3 TROUBLE SHOOTING WITH NO ERROR CODE

Trouble shooting 36
Indoor Unit - No Power
Check Point 1 : Check Installation Condition
Isn't the breaker down?
Check loose or removed connection cable.
>>If abnormal condition is found, correct it by referring
to Installation Manual or Data & Technical Manual.
OK OK
Check Point 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 contact or leak current in
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 3 : Check Electrical Components
Check Fuse(250V 10A) for the indoor unit power supply line
in the outdoor unit.
>> If Fuse is open, check AC208 - 230V appears at outdoor Unit Terminal L - N
and Power Supply PCB in outdoor unit, and replace Fuse.
OK
Check Voltage of power supply.
>> Check AC208 - 230V appears at Indoor Unit Terminal L - N (Power Supply).
YES
Check Fuse (F101) in Filter PCB. (AR)
>> If Fuse is open, check if the wiring between Terminal and Filter PCB
is loose, and replace Fuse.
Check Fuse (F101) in Power PCB. (AU)
>> If Fuse is open, check if the wiring between Terminal and Power PCB
and Main PCB is loose, and replace Fuse.
Check Fuse (F1) in Control PCB. (AS
>> If Fuse is open, check if the wiring between Terminal and Control PCB
is loose, and replace Fuse.
Check Varistor (VA101, VA102) in Filter PCB. (AS,AR)
>> If Varistor is defective, there is a possibility of an abnormal power supply.
Check the correct power supply and replace Varistor.
OK
If the symptom does not change by above Check3, replace Filter PCB. (AR)
Forecast of Cause:
1. Power Supply failure 2. External cause
3. Electrical Components defective
the power supply circuit.
Control PCB. (AU)
, replace Control PCB. (AS)
, replace Power PCB. (AU)
02-40
NO