Trouble shooting 38
Forecast of Cause:
Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)
Check Point 1 : Check indoor and outdoor installation condition
Check Point 3 : Check Electrical Components at Indoor and Outdoor
OK
OK
OKOK
No Operation (Power is ON)
1. Setting/ Connection failure 2. External cause
3. Electrical Component defective
Indoor Unit - Check incorrect wiring between Indoor Unit - Remote Control, or terminals between Indoor Units.
Or, check if there is an open cable connection.
Are these Indoor Unit, Outdoor Unit, and Remote Control suitable model numbers to connect?
>> If there is some abnormal condition, correct it by referring to Installation manual and
Data & Technical Manual.
Turn off Power and check/ correct followings.
Is there loose or removed communication line of Indoor Unit and Outdoor Unit?
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 Voltage at CN10 of Control PCB. < Power supply to Remote Control > (AS)
>> If it is DC12V, Remote Control is failure. (Control PCB is normal) >> Replace Remote Control
>> If it is DC 0V, Control PCB is failure. (Check Remote Control once again) >> Replace Control PCB
>> If the symptom does not change by above Check 1, 2, 3, replace Main PCB of Outdoor unit.
02-42
Check Voltage at CN17 of Control PCB. < Power supply to Remote Control > (AR)
>> If it is DC12V, Remote Control is failure. (Control PCB is normal) >> Replace Remote Control
>> If it is DC 0V, Control PCB is failure. (Check Remote Control once again) >> Replace Control PCB
>> If the symptom does not change by above Check 1, 2, 3, replace Main PCB of Outdoor unit.
Check Voltage at CN14 of Power PCB. < Power supply to Remote Control > (AU)
>> If it is DC12V, Remote Control is failure. (Power PCB is normal) >> Replace Remote Control
>> If it is DC 0V, Power PCB is failure. (Check Remote Control once again) >> Replace Power PCB
>> If the symptom does not change by above Check 1, 2, 3, replace Main PCB of Outdoor unit.
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