Trouble Shooting With No Error Code - Fujitsu AUXB04GALH Service Manual

4-3-3 TROUBLE SHOOTING WITH NO ERROR CODE

Trouble shooting 67
Indoor Unit - No Power
Check Point 1 : Check Installation Condition
Is not 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
Check Point 2 : Check Outside Cause such as 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.
OK
Check Point 3 : Check Electrical Components
Check Voltage of power supply.
>> Check AC230V appears at Indoor Unit Terminal 1 - 2 (Power Supply).
OK
Check the fuse and thermal fuse.
NG
Replace the fuse or thermal fuse.
Check if the power supply terminals section is shorted.
NG
For AS model, advance to OK without checking.
For models other than the AS model, disconnect the cable connecting
the Power Supply PCB and controller PCB and recheck if the power supply terminals
section is not shorted.
(Note) Always check in the power off state.
OK
Replace the controller PCB.
OK
Replace the Display PCB.
NG
If the symptom does not change by above Check 3, replace Controller PCB or Power Supply PCB.
Forecast of Cause :
1. Power Supply failure 2. Outside cause 3. Electrical Component defective
AC
NG
Replace the Power Supply PCB.
NG
04-75
NG
OK
OK