Fujitsu Comfort Series Service Manual page 46

3 TROUBLESHOOTING WITH NO ERROR CODE
Troubleshooting 24
Outdoor unit - No Power
Check Point 1 : Check Installation Condition
Isn't the breaker down?
Check loose or removed connection cable.
>>If abnormal condition is found, correct it by referring
to Installation Manual or Data & Technical Manual.
OK
Check Point 2 : Check external cause at Hydraulic unit and Outdoor unit (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
Check Point 3 : Check Electrical Components
Check the voltage of power supply.
>> Check if AC198 - 264V appears at Outdoor unit Terminal L - N.
YES
Check Fuse in Main PCB.
>> If Fuse is open, check if the wiring between Terminal and Main PCB is loose,
and replace Fuse.
OK
If the symptom does not change by above Check 3, replace Main PCB.
Forecast of Cause:
1.Power Supply failure
3.Electrical Components defective
03-27
2. External cause
AC
NO