E: 39. Indoor Unit Power Supply Error For Fan Motor (Indoor Unit) - Fujitsu ACUH09LUAS1 Service Manual

2-11. E: 39. Indoor unit power supply error for fan motor (Indoor
unit)
→ired remote
Indicator
controller
Detective actuator Indoor unit main PCB
Forecast of cause
Check point 1. 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 2. Check connection of Connector
• Check if connector is removed.
• Check erroneous connection.
• Check if cable is open.
Upon correcting the removed connector or mis-wiring, reset the power.
Check point 3. Replace main PCB
If check point 1 to 2 do not improve the symptom, change main PCB.

2-11. E: 39. Indoor unit power supply error for fan motor (Indoor unit)

Error code
End
• →hen a momentary power cut off
• →hen do not start fan motor
External cause
Connector connection failure
Main PCB failure
- (03-15) -
E: 39
2. Troubleshooting with error code