F99

Malfunction Decision Conditions

  • During startup and operation of cooling and heating, when inverter DC peak data is received by the outdoor internal DC Peak sensing circuitry.

Malfunction Caused

  • DC current peak due to compressor failure.
  • DC current peak due to defective power transistor(s).
  • DC current peak due to defective outdoor unit PCB.
  • DC current peak due to short circuit.

Troubleshooting

When abnormality indication starts again
↓
Reset the error code and turn on the unit again
↓
Is there a sound when compressor starts?
NO (Compressor stops)
→
  • Outdoor electronic circuit defect due to power transistor short
  • Replace the outdoor unit PCB
YES
↓
Is compressor vibration even?
NO (Quite a lot of vibration at start operation)
→
  • Amplification IC defect
  • Diode defect
  • Defect in microcontroller
  • Replace the outdoor unit PCB
YES
↓
Is there no change even if all refrigerant is discharged?
NO (Normal)
→
  • Excessive amount of refrigerant
YES (Stops after 2, 3 seconds
of noise during operation)
↓
Check the compressor winding resistance:
  • Turn off the power and disconnect the harnesses U, V and W
  • Measure the winding resistance between U-V, V-W and W-U
⚠
Caution For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.
↓
Are the compressor's winding resistance (U-V, V-W or U-W) shorted?
NO (Normal)
→
  • Compressor defective due to mechanical locked
  • Replace compressor
YES
↓
YES
►
  • Compressor defective due to winding shorted
  • Replace compressor
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