Fujitsu Airstage V series - Troubleshooting 53: no Operation (Power Is On)

Trouble shooting 53
No Operation (Power is ON)
Check Point 2 :Check outside 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
p Check Voltage between CN17 of Controller PCB (Power supply to Remote Control).
>> If it is DC12V, Remote Control is defective (Controller PCB is normal) >> Replace Remote Control
>> If it is DC 0V, Controller PCB is defective (Check Remote Control once again) >> Replace Controller PCB
p If some of Indoor unit does not operate, replace the Transmission PCB of the non-operative Indoor Unit.
>> If the symptom does not change, replace Controller PCB of Indoor Unit.
p If all of Indoor Units do not operate, check the connection between Controller PCB and Transmission PCB of Outdoor Unit (Main Unit).
>> If the symptom does not change, replace Transmission PCB of O utdoor Unit (Main Unit).
(If it did not work, replace Controller PCB.)
Turn off Power and check/correct followings.
p Isn’t Transmission PCB of Indoor Unit removed?
p Is there loose or removed communication line of Indoor Unit and Outdoor Unit?
p Check Terminator (CN22) is installed on Outdoor Controller PCB.
p Check loose or removed communication line between each Outdoor Unit.
p Check loose Transmission PCB of each Outdoor Unit.
OK
OK
OK
DC
Forecast of Cause :
1. Setting/Connection failure 2. Outside cause
3. Electrical Component defective
p Indoor Unit - Check incorrect wiring between Indoor Unit - Remote Control, or terminals between Indoor Units.
Or, check if there is an open cable connection.
p Check address setting (Are all the address of Indoor and Outdoor correct?)
p 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.
Instant drop ----- Check if there is a large load electric apparatus in the same c ircuit.
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 elec tric line (Neon bulb or electric equipment that may cause
harmonic wave).
Check the complete insulation of grounding.
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