Trouble Shooting With No Error Code - Fujitsu ARYG72LHTA Service Instruction

2-3 TROUBLE SHOOTING WITH NO ERROR CODE

Trouble shooting 38
Indoor Unit - No Power
Attention point
An indoor unit and an outdoor unit are connected, and a power supply has be connected to an indoor unit.
Check Point 1 : Check Installation Condition
Isn't the breaker down?
Check loose or removed connection cable.
>>If abnormal condition was 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 1 - 2 .
YES YES
Check Fuse in Controller PCB
>> If Fuse is open, check if the wiring between Terminal and Controller PCB
is loose, and replace Fuse.
OK
If the symptom does not change by above Check 3, replace Controller PCB
Forecast of Cause:
1. Power Supply failure
3. Electrical Component defect
the power supply circuit.
02-39
2. External cause
NO