Fujitsu R410A, Service Instruction

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Trouble shooting 24
Forecast of Cause:
Test 3 : Check Electrical Components
OK
OK
YES YES
YES
OK
NO
Test 1 : Check Installation Condition
Outdoor Unit - No Power
1. Power Supply failure 2. External cause
3. Electrical Components defective
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.
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.
Check the voltage of power supply.
>> Check if AC187 - 253V appears at Outdoor Unit Terminal L1 - L2.
Check Fuse in Main PCB.
>> If Fuse is open, check if the wiring between Terminal and Main PCB is loose,
and replace Fuse.
Check Active Filter Module and IPM. (SERVICE PARTS INFORMATION 6 and 7)
>> If Active Filter Module or IPM is abnormal, replace it.
If the symptom does not change by above Test 3, replace Main PCB.
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