Trouble shooting 38
Forecast of Cause:
OKOK
Indoor Unit - No Power
1. Power Supply failure 2. External cause
3. Electrical Component defect
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.
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
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.
02-39
2-3 TROUBLE SHOOTING WITH NO ERROR CODE
Check Point 3 : Check Electrical Components
YESYES
OK
NO
Check the voltage of power supply.
>> Check if AC198 - 264V appears at Outdoor Unit Terminal 1 - 2 .
If the symptom does not change by above Check 3, replace Controller PCB
OK
Check Fuse in Controller PCB
>> If Fuse is open, check if the wiring between Terminal and Controller PCB
is loose, and replace Fuse.
Attention point
An indoor unit and an outdoor unit are connected, and a power supply has be connected to an indoor unit.
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