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15.4.27 F99 (DC Peak Detection)
Malfunction Decision Conditions
During startup and operation of cooling, 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 (IPM).
DC current peak due to defective outdoor unit PCB.
DC current peak due to short circuit.
Troubleshooting
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
Outdoor electronic circuit defect due to
power transistor short.
Excessive amount of refrigerant.
Replace the outdoor unit PCB
Compressor defective due to
mechanical locked.
Replace compressor
Compressor defective due to winding
shorted.
Replace compressor
Amplification IC defect.
Diode defect.
Defect in microcontroller.
Replace the outdoor unit PCB.
When F99 indication happens
Reset the error code and turn on the unit
again.
Is there no change even if all refrigerant
is discharged?
Are the compressor’s winding resistance
(U-V, V-W or U-W) shorted?
Is there a sound when compressor starts?
Is compressor vibration even?
YES
YES
YES
Turn off the power and disconnect
the harnesses U, V and W.
Measure the winding resistance
between U-V, V-W and W-U.
Check the compressor winding resistance:
NO (Compressor stops)
NO (Normal)
NO (Normal)
NO (Quite a lot of vibration at
start operation)
YES (Stops after 2, 3 seconds
of noise during operation)
Caution
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