Trouble shooting 25
Forecast of Cause:
NO
OK
OK
OK
OK
Indoor unit - No Power
1. Power supply failure
2. External cause
3. Electrical components defective
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 manual.
Check Point 2 :
Check external cause at indoor unit and outdoor unit (Voltage drop or noise)
Instant voltage drop of ----- Check if there is abnormally large load in the same
power supply power supply system.
Momentary power failure ----- Check if there is a defective contact or leak current in
the power supply system.
Noise ----- Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check whether the ground connection is proper.
Check Point 3 : Check electrical components
02-27
2-3 TROUBLE SHOOTING WITH NO ERROR CODE
Check the voltage of power supply.
>> Check if AC198(AC220V-10%) - 264V(AC240V+10%) appears at indoor unit
Terminal 1 - 2 (Power supply).
Check Fuse(F600) on Power PCB and 20A Fuse .
>> If Fuse is open, check loose terminal, and replace Fuse.
Check Varistor on Filter PCB (VA301, VA302).
>> If Varistor is defective, there is a possibility of an abnormal power supply.
Check the correct power voltage and replace Filter PCB.
OK
If Check Point 1 ~ 3 do not improve the symptom, replace Filter PCB, Power PCB
and controller PCB.
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