Trouble Shooting With No Error Code; Indoor Unit - No Power - Fujitsu ASTG18KMTC Service Instruction

2-3 TROUBLE SHOOTING WITH NO ERROR CODE

Trouble shooting 23

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
Check Point 3 : Check Electrical Components
Check the voltage of power supply.
>> Check if AC198 - 264V appears at Outdoor unit Terminal L - N.
YES YES
Check Fuse in Inverter case assy.
>> If Fuse is open, check if the wiring between Terminal and Main PCB
is loose, and replace Fuse.
Check Varistor in Main PCB.
>> If Varistor is defective, there is a possibility of an abnormal power supply.
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
3. Electrical Components defective
the power supply circuit.
2. External cause
02-33
NO