Troubleshooting 52: Outdoor Unit - No Power - Fujitsu Airstage V series Service Manual

Trouble shooting 52
Outdoor Unit - No Power
Check Point 1 : Check Installation Condition
p Isn't the breaker down?
p 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
p Check the voltage of power supply.
>> Check if AC380V appears at Outdoor Unit Terminal R-S, S-T, T-R, and AC220V at R-N, S-N, T-N.
YES
p Check Fuse (FU1) in Main PCB.
>> If Fuse is open, check loose terminal or removed connector (CN1) , and replace Fuse.
p Check Varistor in Main PCB (VA1, VA2).
>> If Varistor is defective, there is a possibility of an abnormal power supply. (BACK CHECK 1)
Check the correct power supply and replace Varistor.
Upon checking the normal power supply, replace Varistor.
OK
If the symptom does not change by above Check 3, replace Main PCB.
Forecast of Cause :
1. Power Supply failure 2. Outside cause 3. Electrical Components defective
06-61
AC
NO