Fujitsu AUXB04GALH Service Manual page 146

Trouble shooting 68
Outdoor Unit - No Power
Check Point 1 : Check Installation Condition
Isnt 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 Outside Cause such as 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 the reted voltage appears at Outdoor Unit Terminal L1, L3 - N.
OK
Check the fuse on the Filter PCB.
NG
Replace the fuse.
Recheck if the power supply terminals section is shorted.
(Note) Always check in the power off state.
NG
Disconnect connecting cable of the Filter PCB and Main PCB and recheck.
if the power supply terminals section is not shorted.
(Note) Always check in the power off state.
OK
Check If the FAN motor PCB has a
damage or not. ( Check short circuit )
OK
Check if the circuit between pin No. 1 and pin No.4 of CN104/ CN122 on
the Main PCB (8, 10HP) / between pin No. 1 and pin No.3 of CN 701 on
the FAN Driver PCB(12HP) are not short-circuit (Short - NG)
* Disconnect FAN motor when check the circuit
NG
If the symptom does not change by above Check 3, replace Main PCB or Filter PCB
Forecast of Cause :
1. Power Supply failure 2. Outside cause 3. Electrical Components defective
Replace the Filter PCB.
NG
Replace the FAN Motor
AC
NG
NG
04-76
NO