No Operation (Power Is On) - Fujitsu AUXG36KRLB Service Manual

3-3. No operation (Power is on)

Forecast of cause
Check point 1. Check indoor and outdoor installation condition
-> If there is some abnormal condition, correct it by referring to the installation manual and "DESIGN
& TECHNICAL MANUAL".
Turn off the power and check correct followings.
• Is there loose or removed communication line of indoor unit and outdoor unit?
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 sup-
ply 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 . Replace main PCB
If check point 1 to do not improve the symptom, change main PCB.
3-3. No operation (Power is on)
Electrical components defective
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End
- (03-47) -
Setting/ Connection failure
External cause
3. Troubleshooting without error code