Fujitsu AS G07LLCC Series Service Manual page 45

Trouble shooting 22
No Operation (Power is ON)
Check Point 1 : Check indoor and outdoor installation condition
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.
OK
Turn off Power and check/ correct followings.
Is there loose or removed communication line of Indoor Unit and Outdoor 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.
OK OK
If the symptom does not change by above Check 1, 2, replace Main PCB.
Forecast of Cause:
1. Setting/ Connection failure 2. External cause
3. Electrical component defective
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