117
17.5.29 F99 (DC Peak Detection)
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 abonormality indication starts again
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Reset the error code and turn on the unit
again
Is there a sound when compressor starts?
NO (Compressor stops)
YES
Outdoor electronic circuit defect due to
power transistor short
●
●
Replace the outdoor unit PCB
Amplification IC defect
●
●
Diode defect
●
Defect in microcontroller
●
Replace the outdoor unit PCB
Is compressor vibration even?
NO (Quite a lot of vibration at
start operation)
YES
•
Excessive amount of refrigerant
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
YES
Is there no change even if all refrigerant
is discharged?
NO (Normal)
YES (Stops after 2, 3 seconds
of noise during operation)
Are the compressor’s winding resistance
(U-V, V-W or U-W) shorted?
Compressor defective due to
mechanical locked
Replace compressor
NO (Normal)
●
●
•
Compressor defective due to winding
shorted
Replace compressor
●
●
Caution
●
To Next Page
Loading...
