Fujitsu ASU18RLF Service Instructions Manual page 81

Trouble shooting 36
Outdoor unit - No Power
Test 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
Test 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 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
Test 3 : Check Electrical Components
Check the voltage of power supply.
>> Check if AC187 - 253V appears at Outdoor Unit Terminal L1 - L2.
YES
Check Fuse in Main PCB.
>> If Fuse is open, check if the wiring between Terminal and Main PCB is loose,
and replace Fuse.
YES
Check Active Filter Module. (PARTS INFORMATION 8)
>> If Active Filter Module is abnormal, replace it.
OK
Test 4 : Replace Main PCB
If Test 1- 3 do not improve the symptom, replace Main PCB.
(SERVICE PARTS INFORMATION 10)
Forecast of Cause :
1. Power supply failure.
2. External cause.
3. Electrical components defective.
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