Trouble shooting 23
Forecast of Cause:
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 Installation Manual or Data & Technical manual.
02-25
2-3 TROUBLE SHOOTING WITH NO ERROR CODE
Check Point 3 : Check Electrical components
YES
YES
Check the voltage of power supply.
>> Check if AC198 - 264V appears at Outdoor Unit Terminal L - N.
Check Varistor in Power supply PCB (Indoor unit).
>> 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
Check Fuse of between of Terminal and Power supply PCB (Indoor unit).
>> If Fuse is open, check if the wiring between Terminal and
Power supply PCB (Indoor unit) is loose, and replace Fuse.
Check Point 4 : Replace Power supply PCB (Indoor unit)
If Check Point 1- 3 do not improve the symptom, replace Power supply PCB (Indoor unit).
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 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.
AMP Air Conditioning
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