Trouble shooting 26
Forecast of Cause:
YESYES
NO
OKOK
OKOK
OKOK
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 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.
Check Point 3 : Check Electrical Components
Check Voltage of power supply.
>> Check AC198 - 264V appears at Indoor Unit Terminal 1 - 2 (Power Supply).
Check Varistor (VA1) in Controller PCB.
>> If Varistor is defective, there is a possibility of an abnormal power supply.
Check the correct power supply and replace Varistor.
If the symptom does not change by above Check3, replace Controller PCB and Indoor Unit Terminal.
02-29
2-3 TROUBLE SHOOTING WITH NO ERROR CODE
Outdoor unit
Check F101
(Indoor supply
line fuse)
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