Troubleshooting 20
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.
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.
02-24
3. TROUBLESHOOTING WITH NO ERROR CODE
Check Point 3 : Check Electrical Components
YES
YES
NO
Check the voltage of power supply.
>> Check if AC207 - 253V appears at Outdoor Unit Terminal L - N.
Check Fuse in Main PCB.
>> If Fuse is open, check if the wiring between Terminal and Main PCB
is loose, and replace Fuse.
Check Varistor in Main PCB.
>> 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
