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Troubleshooting
Troubleshooting
Diagram 1
2
(7) IPM protection
，
Compressor current protection
（L2、L3、L4)
Main checking point:
●
If the input voltage of the unit is within normal range?
●
If the connection wire of compressor is connected well? Is it loose? If the connection sequence is correct?
●
If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good?
●
If the unit is overloaded? If the heat radiation of the unit is good?
●
If the refrigerant charge is suitable?
Flow chart:
(8) ODU Charging malfunction(U1)
Main checking points:
●
● If the mainboard is broken;
If the wiring of the induction is connected well and if the induction is broken;
Flow chart:
Energize the unit and wait
for 1min
Test the voltage between the two
ends of the electrolytic capacitor
with the DC shift of the universal
meter
The voltage is above 100V
yes
yes
yes
no
no
no
The detection circuit of
the outdoor mainboard
has malfunction
Replace the out-
door mainboard
Check if the induction wiring is loose
or the induction is cut off
The induction is cut off or the
wiring is loose
Replace the induction or
reconnect the loose wire
Malfunction is eliminated
Replace the outdoor
mainboard
End
Diagram 1
1
